[x86][Windows] Clang-cl does not emit the expected code on 32-bit x86 for __iso_volatile_store64 and __iso_volatile_load64 intrinsics #156228
Description
The expected codegen for all __iso_volatile_load... and __iso_volatile_store... is non tearing load and store.
These intrinsics are used in <atomic>.
For x86 MSVC emits movq, when it is allowed to use SSE2, or fistp otherwise. See https://godbolt.org/z/jcd1PM6xj
clang-cl emits pair of 32 bit operations, it should emit non-tearing operations.
C:\Program Files\Microsoft Visual Studio\2022\Preview>clang-cl --version
clang version 19.1.5
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\Llvm\x64\bin