[clang] [X86] Change target of __builtin_ia32_cmp[p|s][s|d] from avx into sse/sse2 (PR #67410)

[Simon Pilgrim via cfe-commits]

https://github.com/RKSimon commented:

No strong objections, but I think the documentation needs to be tweaked to better explain SSE vs AVX handling.

https://github.com/llvm/llvm-project/pull/67410