[clang] [clang][AST] Fix assertion in `getFullyQualifiedType` for AutoType (PR #186105)

[Harald van Dijk via cfe-commits]

hvdijk wrote:

Thanks for testing. Do you want to submit a PR since you already have a test for `UnaryTransformType`, or would you prefer to keep the code change and the test separate?

LLVM 22.1.3 is due to be released in two days so it would be great if we have time to get that fix in.

https://github.com/llvm/llvm-project/pull/186105