[PATCH] D20279: [clang-tidy] Cleanups utils files

[Etienne Bergeron via cfe-commits]

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

Cleanup some code by using appropriate APIs.
Some coding style cleanups.

There is no behavior changes.

http://reviews.llvm.org/D20279

Files:
  clang-tidy/utils/DeclRefExprUtils.cpp
  clang-tidy/utils/HeaderFileExtensionsUtils.cpp
  clang-tidy/utils/HeaderFileExtensionsUtils.h
  clang-tidy/utils/HeaderGuard.cpp
  clang-tidy/utils/IncludeInserter.cpp
  clang-tidy/utils/IncludeInserter.h
  clang-tidy/utils/IncludeSorter.cpp
  clang-tidy/utils/IncludeSorter.h
  clang-tidy/utils/TypeTraits.cpp

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