[clang] [clang][NFC] Prevent scope pollution from repeat type specifiers (PR #193144)

[Corentin Jabot via cfe-commits]

https://github.com/cor3ntin commented:

This is a cleaner fix - i like it

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Please add an entry to `clang/docs/ReleaseNotes.rst` in the section the most adapted to the change, and referencing any Github issue this change fixes. Thanks!

https://github.com/llvm/llvm-project/pull/193144