[clang] [X86][Clang] Allow constexpr evaluation of F16C CVTPS2PH intrinsics (PR #162295)

[Simon Pilgrim via cfe-commits]

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@@ -3002,6 +3002,91 @@ static bool interp__builtin_vec_set(InterpState &S, CodePtr OpPC,
   return true;
 }
 
+static bool interp__builtin_ia32_vcvtps2ph(InterpState &S, CodePtr OpPC,
+                                           const CallExpr *Call) {
+  // Arguments are: vector of floats, rounding immediate
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RKSimon wrote:

Yes - the older F16C/AVX512 ps2ph builtins returned <X x i16> types to represent bitcast vectors of half floats, only the more recent variants moved to using <X x f16>

https://github.com/llvm/llvm-project/pull/162295