[clang] [clang] Inject IndirectFieldDecl even if name conflicts. (PR #153140)

[via cfe-commits]

SergejSalnikov wrote:

Should the following example really fail:
```
class A {
  int operator_() const;

  union {
    int operator_;
  };
}
```


https://github.com/llvm/llvm-project/pull/153140