[clang] [clang] fix the unexpected controlflow in `ParseTentative.cpp` (PR #95917)

[Nikita Popov via cfe-commits]

nikic wrote:

FWIW, I think it would be fine to just merge this PR as-is without a test case. It seems pretty clear that this was the original intention of the code.

https://github.com/llvm/llvm-project/pull/95917