Qiongsi Wu 1418018502
[clang][ObjectiveC] Fix Parsing the :: Optional Scope Specifier (#119908)
The parser hangs when processing types/variables prefixed by `::` as an
optional scope specifier. For example,
```
- (instancetype)init:(::A *) foo;
```

The parser should not hang, and it should emit an error. This PR
implements the error check.

rdar://140885078
2024-12-20 09:47:26 -08:00
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