[clang] [clang][ObjectiveC] Fix Parsing Method Parameter Types with the `::` Prefix (PR #119908)

[Volodymyr Sapsai via cfe-commits]

vsapsai wrote:

I don't know if we have a test for it but I've realized there are cases where you can have a legitimate double colon in Objective-C. For example,
```objective-c
@interface NSObject
@end

@implementation NSObject
- (void)performSelector:(SEL)selector {}

- (void)double:(int)firstArg :(int)secondArg colon:(int)thirdArg {}

- (void)test {
  [self performSelector:@selector(double::colon:)];
}
@end
```

It's not a method parameter type, so it is possible your code isn't executed. But it is worth checking if we test this case.

https://github.com/llvm/llvm-project/pull/119908