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

[Simon Pilgrim via cfe-commits]

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@@ -4742,6 +4742,125 @@ static __inline__ __m128d __DEFAULT_FN_ATTRS _mm_castsi128_pd(__m128i __a) {
   return (__m128d)__a;
 }
 
+/// Compares each of the corresponding double-precision values of two
+///    128-bit vectors of [2 x double], using the operation specified by the
+///    immediate integer operand.
+///
+///    Returns a [2 x double] vector consisting of two doubles corresponding to
+///    the two comparison results: zero if the comparison is false, and all 1's
+///    if the comparison is true.
+///
+/// \headerfile <x86intrin.h>
+///
+/// \code
+/// __m128d _mm_cmp_pd(__m128d a, __m128d b, const int c);
+/// \endcode
+///
+/// This intrinsic corresponds to the <c> VCMPPD </c> instruction.
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RKSimon wrote:

(V)CMPPD ?

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