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

[Shafik Yaghmour via cfe-commits]

shafik wrote:

So this is the commit that introduced this 06e41ae5c77c6

and it looks like code like this:

```objc
id<NSObject> x(id<NSObject>(0));
```

we are trying to differentiate a protocol Vs the next parameter?

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