[clang] [Headers][X86] Allow AVX512 masked arithmetic ss/sd intrinsics to be used in constexpr (PR #162816)

[Simon Pilgrim via cfe-commits]

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@@ -80,6 +80,11 @@ constexpr bool match_v2du(__m128i _v, unsigned long long a, unsigned long long b
   return v[0] == a && v[1] == b;
 }
 
+constexpr bool match_v2df(__m128d _v, double a, double b){
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RKSimon wrote:

Why not use match_m128d?

https://github.com/llvm/llvm-project/pull/162816