[clang] [X86][Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow AVX512 mask predicate intrinsics to be used in constexpr (PR #165054)

[Simon Pilgrim via cfe-commits]

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@@ -3361,6 +3361,26 @@ static bool interp__builtin_ia32_vpconflict(InterpState &S, CodePtr OpPC,
   return true;
 }
 
+static bool interp__builtin_ia32_cvt_vec2mask(InterpState &S, CodePtr OpPC,
+                                              const CallExpr *Call,
+                                              unsigned ID) {
+  assert(Call->getNumArgs() == 1);
+
+  const Pointer &Vec = S.Stk.pop<Pointer>();
+  APInt RetMask(Vec.getNumElems(), 0);
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RKSimon wrote:

RetWidth ?

https://github.com/llvm/llvm-project/pull/165054