[clang] [X86][Clang] Support constexpr evaluation of cvtpd2ps intrinsics (PR #169980)

[Simon Pilgrim via cfe-commits]

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@@ -3359,6 +3391,122 @@ static bool interp__builtin_ia32_cvt_vec2mask(InterpState &S, CodePtr OpPC,
   pushInteger(S, RetMask, Call->getType());
   return true;
 }
+static bool interp__builtin_ia32_cvtsd2ss(InterpState &S, CodePtr OpPC,
+                                          const CallExpr *Call, bool HasMask,
+                                          bool HasRounding) {
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RKSimon wrote:

HasRounding looks unnecessary - merge with HasMask into `HasRoundingMask`?

https://github.com/llvm/llvm-project/pull/169980