[clang] [Clang][AST] Don't use canonical type when checking dependence in Type::isOverloadable (PR #98563)

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https://github.com/cor3ntin approved this pull request.

LGTM, modulo
 - missing release note
 -  can you move the test in a GH97646 namespace and put it in `decltype.cpp`,
  or rename `typeof_unqual.cpp` to typeof.cpp and put it there?

Maybe, while you are at it, add a test for `__typeof_unqual`

Thanks!

https://github.com/llvm/llvm-project/pull/98563