[PATCH] D20909: [clang-tidy] Ignore function context in misc-unused-using-decls.

[Haojian Wu via cfe-commits]

hokein created this revision.
hokein added a reviewer: alexfh.
hokein added a subscriber: cfe-commits.

Make the check's behavior more correct when handling using-decls in multiple scopes.

http://reviews.llvm.org/D20909

Files:
  clang-tidy/misc/UnusedUsingDeclsCheck.cpp
  clang-tidy/misc/UnusedUsingDeclsCheck.h
  test/clang-tidy/misc-unused-using-decls.cpp

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