[clang] [clang]: support std::meta::info for primitive types (PR #190356)

[via cfe-commits]

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@@ -13102,7 +13102,10 @@ StmtResult TreeTransform<Derived>::TransformUnresolvedSYCLKernelCallStmt(
 template <typename Derived>
 ExprResult TreeTransform<Derived>::TransformCXXReflectExpr(CXXReflectExpr *E) {
   // TODO(reflection): Implement its transform
-  assert(false && "not implemented yet");
+  if (!E->isTypeDependent())
+    return E;
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Sirraide wrote:

This isn’t quite right: `E` itself should never be type-dependent because its type is _always_ `std::meta::info`; I think you meant to check if the contained type (if it is one) is type-dependent, but that wouldn’t be correct either I believe because it might still be instantiation-dependent. 

I’d suggest either leaving this function unchanged for now if we don’t want to support templates yet, or alternatively, implement it properly, i.e. `switch` on the reflection kind and call `TransformType()` if it is a type (which should be at most like 10 LOC).

https://github.com/llvm/llvm-project/pull/190356