[clang] [Headers][X86] Enable constexpr handling for pmulhw/pmulhuw intrinsics (PR #152540)

[Phoebe Wang via cfe-commits]

================
@@ -11653,6 +11659,18 @@ bool VectorExprEvaluator::VisitCallExpr(const CallExpr 
*E) {
             APSInt(LHS.isSigned() ? LHS.ssub_sat(RHS) : LHS.usub_sat(RHS),
                    DestEltTy->isUnsignedIntegerOrEnumerationType())));
         break;
+      case clang::X86::BI__builtin_ia32_pmulhuw128:
+      case clang::X86::BI__builtin_ia32_pmulhuw256:
+      case clang::X86::BI__builtin_ia32_pmulhuw512:
+        ResultElements.push_back(APValue(APSInt(llvm::APIntOps::mulhu(LHS, 
RHS),
----------------
phoebewang wrote:

Should the input and output types be unsigned?

https://github.com/llvm/llvm-project/pull/152540
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