[clang] [clang][Sema] Fix crash when checking scalar type with excess braces (PR #192471)

[Yanzuo Liu via cfe-commits]

zwuis wrote:

> The following issues have been fixed by this PR.
> - [GH-137845](https://github.com/llvm/llvm-project/issues/137845)
> - [GH-69213](https://github.com/llvm/llvm-project/issues/69213)
> - [GH-198767](https://github.com/llvm/llvm-project/issues/198767)

Please add them to tests and use this syntax https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue in PR description. Thanks!

https://github.com/llvm/llvm-project/pull/192471