[PATCH] [clang-tidy] Implement the include order checker for LLVM.

[Benjamin Kramer]

- Moved everything into the PPCallback. Required adding some accessors to ClangTidyCheck.
- Removed check for "first decl", don't report errors from the main file.
- Made test use check_clang_tidy_fix.sh. Add dummy headers and make the script forward arguments.

http://reviews.llvm.org/D4741

Files:
  clang-tidy/ClangTidy.h
  clang-tidy/llvm/IncludeOrderCheck.cpp
  test/clang-tidy/Inputs/Headers/a.h
  test/clang-tidy/Inputs/Headers/b.h
  test/clang-tidy/Inputs/Headers/clang-c/c.h
  test/clang-tidy/Inputs/Headers/clang/b.h
  test/clang-tidy/Inputs/Headers/gtest/foo.h
  test/clang-tidy/Inputs/Headers/i.h
  test/clang-tidy/Inputs/Headers/j.h
  test/clang-tidy/Inputs/Headers/llvm-c/d.h
  test/clang-tidy/Inputs/Headers/llvm/a.h
  test/clang-tidy/Inputs/Headers/s.h
  test/clang-tidy/Inputs/empty.h
  test/clang-tidy/check_clang_tidy_fix.sh
  test/clang-tidy/llvm-include-order.cpp
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