refactor: stop allocating on tuple and list hashing #42435

Job	Run time
Documentation	52s
Format	1m 36s
Tests (Nix) (ubuntu-latest)	9m 12s
Bootstrap with OxCaml (ubuntu-latest)	19m 15s
Bootstrap with OCaml 4.02 (ubuntu-latest)	4m 11s
Bootstrap with OCaml 5.4 (macos-latest)	2m 14s
Bootstrap with OCaml 5.4 (ubuntu-latest)	1m 17s
Ensure no files with CRLF line endings are committed to the repo	4s
Test that the utop dev tool can be built and run	12m 59s
Bootstrap on Cygwin	3m 4s
Bootstrap with OCaml 4.14 (ubuntu-latest)	1m 30s
Build (opam) (5.4.x, 5.4.x, macos-latest, true)	25m 41s
Build (opam) (4.14.x, 4.14.x, macos-latest)	7m 0s
Build (opam) (5.4.x, 5.4.x, macos-15-intel)	13m 32s
Build (opam) (ocaml-variants.5.6.0+trunk, ocaml-variants.5.6.0+trunk, ubuntu-latest)	5m 3s
Build (opam) (ocaml-base-compiler.5.4.0,system-mingw, windows-latest, ocaml-compiler.5.4.0-system...	22m 33s
Build (opam) (4.14.x, 4.14.x, ubuntu-latest)	4m 19s
Build (opam) (ocaml-compiler.5.4.0,system-msvc, windows-latest, ocaml-compiler.5.4.0-system-msvc,...	19m 7s
Build (opam) (ocaml-variants.4.14.2+options,ocaml-option-32bit, ocaml-variants.4.14.2-ocaml-optio...	4m 15s
Build (opam) (5.4.x, 5.4.x, ubuntu-latest, true)	14m 17s
Rocq Tests (native)	2m 36s
Rocq Tests	7m 38s
OxCaml Tests (opam)	35m 24s
OxCaml Tests (Nix)	41m 2s
Build microbenchmarks	2m 0s
Wasm_of_ocaml Tests	6m 51s
Create local opam switch (macos-latest, 5)	9m 54s
Create local opam switch (ubuntu-latest, 5)	5m 59s
	4h 43m 25s

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