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

[John McCall via cfe-commits]

rjmccall wrote:

> @rjmccall -- do you have ideas on how we can trigger the issue here or do you think this code can be removed?

I wouldn't be surprised either way — tentative parsing often contains code that feels like it ought to be redundant, but it also often takes strange paths in strange situations.

You might try writing `ident<ident>` in something like the parameter clause of a local function declaration, where ObjC++ will have to disambiguate it from a direct initialization but where the parser will enter tentative parsing without `ident<ident>` being the immediately following token.

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