[PATCH] [clang-tidy] Add a checker for zero-length memset.

[Benjamin Kramer]

Hi alexfh, djasper,

If there's memset(x, y, 0) in the code it's most likely a mistake. The
checker suggests a fix-it to swap 'y' and '0'.

I think this has the potential to be promoted into a general clang warning
after some testing in clang-tidy.

http://reviews.llvm.org/D4535

Files:
  clang-tidy/google/CMakeLists.txt
  clang-tidy/google/GoogleTidyModule.cpp
  clang-tidy/google/MemsetZeroLengthCheck.cpp
  clang-tidy/google/MemsetZeroLengthCheck.h
  test/clang-tidy/google-memset-zero-length.cpp
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