refactor rustc-hash integration

[llogiq]

I found that rustc-hash is used in multiple compiler crates. Also some types use FxBuildHasher whereas others use BuildHasherDefault<FxHasher> (both do the same thing).

In order to simplify future hashing experiments, I changed every location to use rustc_data_structures::fx::* types instead, and also removed the BuildHasherDefault variant. This will simplify future experiments with hashing (for example trying out a hasher that doesn't implement Default for whatever reason).

[rustbot]

Some changes occurred in exhaustiveness checking

cc @Nadrieril

These commits modify the Cargo.lock file. Unintentional changes to Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

[rustbot]

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[bjorn3]

rustc_data_structures doesn't compile on stable, but rustc_type_ir needs to support stable for rust-analyzer.

[llogiq]

Why doesn't it compile on stable, though?

[bjorn3]

Among other things it uses #[may_dangle] for arenas, enables the nightly feature of hashbrown, uses rustc_macros (which needs feature(proc_macro_diagnostics, proc_macro_tracked_env)), rustc_serialize (which needs specialization) and it uses a whole bunch more unstable features:

rust/compiler/rustc_data_structures/src/lib.rs

Lines 15 to 36 in 24ac030

	#![feature(allocator_api)]
	#![feature(ascii_char)]
	#![feature(ascii_char_variants)]
	#![feature(assert_matches)]
	#![feature(auto_traits)]
	#![feature(cfg_select)]
	#![feature(core_intrinsics)]
	#![feature(dropck_eyepatch)]
	#![feature(extend_one)]
	#![feature(file_buffered)]
	#![feature(map_try_insert)]
	#![feature(min_specialization)]
	#![feature(negative_impls)]
	#![feature(never_type)]
	#![feature(ptr_alignment_type)]
	#![feature(rustc_attrs)]
	#![feature(sized_hierarchy)]
	#![feature(test)]
	#![feature(thread_id_value)]
	#![feature(trusted_len)]
	#![feature(type_alias_impl_trait)]
	#![feature(unwrap_infallible)]

[bjorn3]

This too breaks the way compilation on stable is handled.

[rust-log-analyzer]

The job x86_64-gnu-gcc failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

---- [run-make] tests/run-make-cargo/rustc-crates-on-stable stdout ----

error: rmake recipe failed to complete
status: exit status: 1
command: cd "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-make-cargo/rustc-crates-on-stable/rmake_out" && env -u RUSTFLAGS -u __RUSTC_DEBUG_ASSERTIONS_ENABLED -u __STD_DEBUG_ASSERTIONS_ENABLED -u __STD_REMAP_DEBUGINFO_ENABLED AR="ar" BUILD_ROOT="/checkout/obj/build/x86_64-unknown-linux-gnu" CARGO="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools-bin/cargo" CC="cc" CC_DEFAULT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m64" CXX="c++" CXX_DEFAULT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m64" HOST_RUSTC_DYLIB_PATH="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" LD_LIBRARY_PATH="/checkout/obj/build/x86_64-unknown-linux-gnu/bootstrap-tools/x86_64-unknown-linux-gnu/release/deps:/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/lib/rustlib/x86_64-unknown-linux-gnu/lib" LD_LIB_PATH_ENVVAR="LD_LIBRARY_PATH" LLVM_BIN_DIR="/checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/bin" LLVM_COMPONENTS="aarch64 aarch64asmparser aarch64codegen aarch64desc aarch64disassembler aarch64info aarch64utils aggressiveinstcombine all all-targets amdgpu amdgpuasmparser amdgpucodegen amdgpudesc amdgpudisassembler amdgpuinfo amdgputargetmca amdgpuutils analysis arm armasmparser armcodegen armdesc armdisassembler arminfo armutils asmparser asmprinter avr avrasmparser avrcodegen avrdesc avrdisassembler avrinfo binaryformat bitreader bitstreamreader bitwriter bpf bpfasmparser bpfcodegen bpfdesc bpfdisassembler bpfinfo cfguard cgdata codegen codegentypes core coroutines coverage csky cskyasmparser cskycodegen cskydesc cskydisassembler cskyinfo debuginfobtf debuginfocodeview debuginfodwarf debuginfodwarflowlevel debuginfogsym debuginfologicalview debuginfomsf debuginfopdb demangle dlltooldriver dwarfcfichecker dwarflinker dwarflinkerclassic dwarflinkerparallel dwp engine executionengine extensions filecheck frontendatomic frontenddirective frontenddriver frontendhlsl frontendoffloading frontendopenacc frontendopenmp fuzzercli fuzzmutate globalisel hexagon hexagonasmparser hexagoncodegen hexagondesc hexagondisassembler hexagoninfo hipstdpar instcombine instrumentation interfacestub interpreter ipo irprinter irreader jitlink libdriver lineeditor linker loongarch loongarchasmparser loongarchcodegen loongarchdesc loongarchdisassembler loongarchinfo lto m68k m68kasmparser m68kcodegen m68kdesc m68kdisassembler m68kinfo mc mca mcdisassembler mcjit mcparser mips mipsasmparser mipscodegen mipsdesc mipsdisassembler mipsinfo mirparser msp430 msp430asmparser msp430codegen msp430desc msp430disassembler msp430info native nativecodegen nvptx nvptxcodegen nvptxdesc nvptxinfo objcarcopts objcopy object objectyaml option orcdebugging orcjit orcshared orctargetprocess passes powerpc powerpcasmparser powerpccodegen powerpcdesc powerpcdisassembler powerpcinfo profiledata remarks riscv riscvasmparser riscvcodegen riscvdesc riscvdisassembler riscvinfo riscvtargetmca runtimedyld sandboxir scalaropts selectiondag sparc sparcasmparser sparccodegen sparcdesc sparcdisassembler sparcinfo support symbolize systemz systemzasmparser systemzcodegen systemzdesc systemzdisassembler systemzinfo tablegen target targetparser telemetry textapi textapibinaryreader transformutils vectorize webassembly webassemblyasmparser webassemblycodegen webassemblydesc webassemblydisassembler webassemblyinfo webassemblyutils windowsdriver windowsmanifest x86 x86asmparser x86codegen x86desc x86disassembler x86info x86targetmca xray xtensa xtensaasmparser xtensacodegen xtensadesc xtensadisassembler xtensainfo" LLVM_FILECHECK="/checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/bin/FileCheck" PYTHON="/usr/bin/python3" RUSTC="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" RUSTDOC="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" SOURCE_ROOT="/checkout" TARGET="x86_64-unknown-linux-gnu" TARGET_EXE_DYLIB_PATH="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-make-cargo/rustc-crates-on-stable/rmake"
stdout: none
--- stderr -------------------------------
command failed at line 41
Command { cmd: LD_LIBRARY_PATH="/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-make-cargo/rustc-crates-on-stable/rmake_out:/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib:/checkout/obj/build/x86_64-unknown-linux-gnu/bootstrap-tools/x86_64-unknown-linux-gnu/release/deps:/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/lib/rustlib/x86_64-unknown-linux-gnu/lib" RUSTC="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" RUSTC_STAGE="0" RUSTFLAGS="-Zallow-features=" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools-bin/cargo" "build" "--manifest-path" "/checkout/Cargo.toml" "--no-default-features" "--target-dir" "target" "-p" "rustc_type_ir" "-p" "rustc_next_trait_solver" "-p" "rustc_pattern_analysis" "-p" "rustc_lexer" "-p" "rustc_abi" "-p" "rustc_parse_format" "-p" "rustc_hashes", stdin_buf: None, stdin: None, stdout: None, stderr: None, drop_bomb: DropBomb { command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools-bin/cargo", defused: true, armed_location: Location { file: "src/tools/run-make-support/src/external_deps/cargo.rs", line: 14, column: 19 } }, already_executed: true }
output status: `exit status: 101`
=== STDOUT ===



=== STDERR ===
    Blocking waiting for file lock on package cache
---
   Compiling smallvec v1.15.1
error[E0725]: the feature `dropck_eyepatch` is not in the list of allowed features
##[error]  --> /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/smallvec-1.15.1/src/lib.rs:96:45
   |
96 | #![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
   |                                             ^^^^^^^^^^^^^^^

error[E0658]: `may_dangle` has unstable semantics and may be removed in the future
##[error]    --> /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/smallvec-1.15.1/src/lib.rs:2133:13
     |
2133 | unsafe impl<#[may_dangle] A: Array> Drop for SmallVec<A> {
     |             ^^^^^^^^^^^^^
     |
     = note: see issue #34761 <https://github.com/rust-lang/rust/issues/34761> for more information
     = help: add `#![feature(dropck_eyepatch)]` to the crate attributes to enable
     = note: this compiler was built on 2025-12-24; consider upgrading it if it is out of date

   Compiling shlex v1.3.0
Some errors have detailed explanations: E0658, E0725.
For more information about an error, try `rustc --explain E0658`.

For more information how to resolve CI failures of this job, visit this link.