[clang] [Headers][X86] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow PALIGNR byte shift intrinsics to be used in constexpr (PR #162005)

[Simon Pilgrim via cfe-commits]

================
@@ -13080,6 +13080,42 @@ bool VectorExprEvaluator::VisitCallExpr(const CallExpr 
*E) {
 
     return Success(APValue(ResultElements.data(), ResultElements.size()), E);
   }
+
+  case X86::BI__builtin_ia32_palignr128:
+  case X86::BI__builtin_ia32_palignr256:
+  case X86::BI__builtin_ia32_palignr512: {
+    assert(E->getNumArgs() == 3);
----------------
RKSimon wrote:

Use evalShuffleGeneric?

https://github.com/llvm/llvm-project/pull/162005
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