[clang] [clang] Fix crash with multiple non-parenthsized `sizeof` (PR #101297)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

> Testing for stack exhaustion is always a challenge and so it is reasonable for this to not come with a test case. However, did you manually verify that it fixes the crash for you?

Yes, the test I originally included wasn't passing without my fix, but passed with my fix locally.

https://github.com/llvm/llvm-project/pull/101297