David Farler e55191f7d5 [Migrator] Don't take redundant replacements during AST Passes ...

We already had this functionality in the FixitApplyDiagnosticConsumer,
but we also need it in the AST passes because different entries in the
API diff data may drive identical fix-its, namely a general type rename,
which can occur anywhere a DeclRef appears, but also for function overrides'
parameter type changes, which are context specific.

rdar://problem/32431533

2017-06-14 14:21:51 -07:00

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