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

[Timm Baeder via cfe-commits]

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@@ -2472,6 +2470,8 @@ static bool CheckEvaluationResult(CheckEvaluationResultKind CERK,
         Value.getUnionValue(), Kind, Value.getUnionField(), CheckedTemps);
   }
   if (Value.isStruct()) {
+    if (Type->isMetaInfoType())
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tbaederr wrote:

Since these reflection values are produced during an evaluation (and not just the end result of one), this requires adding a new `PrimType`. Since that's more complicated than just adding a new `APValue` kind, I think it's fine to leave out support for the bytecode interpreter for now. We do want to add support for it soon enough of course, but it requires more design considerations.

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