Disable f16 portable-simd tests on x86_64-pc-windows-gnu

Taken from rust-lang/portable-simd#520

Author: bjorn3

patches/0001-portable_simd-disable-f16-tests-for.patch

@@ -0,0 +1,46 @@
+From 1f19d30c40349566cbb9eb713db771ef73806943 Mon Sep 17 00:00:00 2001
+From: Folkert de Vries <folkert@folkertdev.nl>
+Date: Thu, 16 Apr 2026 15:56:54 +0200
+Subject: [PATCH] disable `f16` tests for the cranelift backend
+
+---
+ crates/core_simd/Cargo.toml       | 8 ++++++++
+ crates/core_simd/tests/f16_ops.rs | 5 +++++
+ 2 files changed, 13 insertions(+)
+
+diff --git a/crates/core_simd/Cargo.toml b/crates/core_simd/Cargo.toml
+index 6e576084ecf..05fc63a6a29 100644
+--- a/crates/core_simd/Cargo.toml
++++ b/crates/core_simd/Cargo.toml
+@@ -31,3 +31,11 @@ path = "../test_helpers"
+ 
+ [dev-dependencies]
+ std_float = { path = "../std_float/", features = ["as_crate"] }
++
++[lints.rust.unexpected_cfgs]
++level = "warn"
++check-cfg = [
++    # Internal features aren't marked known config by default, we use these to
++    # gate tests.
++    'cfg(target_has_reliable_f16_math)',
++]
+diff --git a/crates/core_simd/tests/f16_ops.rs b/crates/core_simd/tests/f16_ops.rs
+index f89bdf4738f..415fffb3af2 100644
+--- a/crates/core_simd/tests/f16_ops.rs
++++ b/crates/core_simd/tests/f16_ops.rs
+@@ -1,5 +1,7 @@
+ #![feature(portable_simd)]
+ #![feature(f16)]
++#![expect(internal_features)]
++#![feature(cfg_target_has_reliable_f16_f128)]
+ 
+ #[macro_use]
+ mod ops_macros;
+@@ -7,4 +9,7 @@ mod ops_macros;
+ // FIXME: some f16 operations cause rustc to hang on wasm simd
+ // https://github.com/llvm/llvm-project/issues/189251
+ #[cfg(not(all(target_arch = "wasm32", target_feature = "simd128")))]
++// FIXME: the cranelift backend runs these tests for x86_64-pc-windows-gnu
++// where it does not have full support for f16 yet.
++#[cfg(target_has_reliable_f16_math)]
+ impl_float_tests! { f16, i16 }