[clang] [clang] VectorExprEvaluator::VisitCallExpr - add constant folding for X86 pslldqi/psrldqi intrinsics (PR #157403)

[Simon Pilgrim via cfe-commits]

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@@ -2047,7 +2049,8 @@ let Features = "avx512vl", Attributes = [NoThrow, Const, Constexpr, RequiredVect
   def psravq256 : X86Builtin<"_Vector<4, long long int>(_Vector<4, long long int>, _Vector<4, long long int>)">;
 }
 
-let Features = "avx512bw", Attributes = [NoThrow, Const, RequiredVectorWidth<512>] in {
+let Features = "avx512bw",
+    Attributes = [NoThrow, Const, Constexpr, RequiredVectorWidth<512>] in {
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RKSimon wrote:

Move the byteshfts down to the block containing pmulhw512?

https://github.com/llvm/llvm-project/pull/157403