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2df6b0773e
Make clashing_extern_declarations considering generic args for ADT field
In following example, G<u16> should be recognized as different from G<u32> :
```rust
#[repr(C)] pub struct G<T> { g: [T; 4] }
pub mod x { extern "C" { pub fn g(_: super::G<u16>); } }
pub mod y { extern "C" { pub fn g(_: super::G<u32>); } }
```
fixes #130851