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

[Simon Pilgrim via cfe-commits]

================
@@ -4636,6 +4674,26 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, 
const CallExpr *Call,
           return APInt(8, 0);
         });
 
+  case X86::BI__builtin_ia32_palignr128:
+  case X86::BI__builtin_ia32_palignr256:
+  case X86::BI__builtin_ia32_palignr512:
+    return interp__builtin_x86_palignr(
----------------
RKSimon wrote:

You should be able to use interp__builtin_ia32_shuffle_generic now?

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