[clang] [clang-tools-extra] [llvm] [clang]: reflection operator parsing for global namespace and primitive types (PR #164692)

[via llvm-commits]

================
@@ -2189,8 +2222,9 @@ ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() {
   assert(Tok.isOneOf(tok::kw_sizeof, tok::kw___datasizeof, tok::kw___alignof,
                      tok::kw_alignof, tok::kw__Alignof, tok::kw_vec_step,
                      tok::kw___builtin_omp_required_simd_align,
-                     tok::kw___builtin_vectorelements, tok::kw__Countof) &&
-         "Not a sizeof/alignof/vec_step expression!");
+                     tok::kw___builtin_vectorelements, tok::kw__Countof) ||
+         (getLangOpts().Reflection && Tok.is(tok::caretcaret)) &&
+             "Not a sizeof/alignof/vec_step expression!");
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Sirraide wrote:

```suggestion
                     tok::kw___builtin_vectorelements, tok::kw__Countof, tok::caretcaret) &&
             "Not a sizeof/alignof/vec_step expression!");
```
I feel like this is enough; we don’t need to assert we’re in reflexion mode *everywhere* where we use `tok::caretcaret`.

https://github.com/llvm/llvm-project/pull/164692