[clang] [clang] fix the unexpected control flow in ParseTentative.cpp (PR #109298)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

So I think on my last comment, using `break` as opposed to `continue` makes sense. Agree @cor3ntin 

https://github.com/llvm/llvm-project/pull/109298