[PATCH] [clang-tidy] Add a generic header guard checker + LLVM implementation.

[Benjamin Kramer]

- Clean PPCallbacks state after leaving file.
- Comment fixes.
- Also apply the style to header files outside of include/

http://reviews.llvm.org/D4867

Files:
  clang-tidy/CMakeLists.txt
  clang-tidy/llvm/CMakeLists.txt
  clang-tidy/llvm/HeaderGuardCheck.cpp
  clang-tidy/llvm/HeaderGuardCheck.h
  clang-tidy/llvm/LLVMTidyModule.cpp
  clang-tidy/utils/CMakeLists.txt
  clang-tidy/utils/HeaderGuard.cpp
  clang-tidy/utils/HeaderGuard.h
  unittests/clang-tidy/LLVMModuleTest.cpp
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