[clang] [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow AVX/AVX512 subvector insertion intrinsics to be used in constexpr #157709 (PR #158778)

[Timm Baeder via cfe-commits]

================
@@ -2937,6 +2937,50 @@ static bool interp__builtin_elementwise_triop(
   return true;
 }
 
+static bool interp__builtin_x86_insert_subvector(InterpState &S, CodePtr OpPC,
+                                                 const CallExpr *Call,
+                                                 unsigned ID) {
+  assert(Call->getNumArgs() == 3);
+
+  PrimType ImmPT = *S.getContext().classify(Call->getArg(2));
+  APSInt ImmAPS = popToAPSInt(S.Stk, ImmPT);
----------------
tbaederr wrote:

```suggestion
  PrimType ImmPT = *S.getContext().classify(Call->getArg(2));
  APSInt ImmAPS = popToAPSInt(S, Call->getArg(2));
```
You need to rebase for that though.

https://github.com/llvm/llvm-project/pull/158778