[PATCH] [clang-tidy] Add a checker for long functions.

[Benjamin Kramer]

- Added configurability via ClangTidyOptions.
- Turned the unit test into a lit test.

http://reviews.llvm.org/D4986

Files:
  clang-tidy/misc/CMakeLists.txt
  clang-tidy/misc/FunctionSize.cpp
  clang-tidy/misc/FunctionSize.h
  clang-tidy/misc/MiscTidyModule.cpp
  clang-tidy/tool/ClangTidyMain.cpp
  test/clang-tidy/misc-function-size.cpp
  unittests/clang-tidy/CMakeLists.txt
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