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

[Benjamin Kramer]

- Make the checker more aggressive by also looking at values that always evaluate to zero.
- Remove the restriction on literals in the middle argument. cpplint did this to reduce false positives from testing code, I don't buy that excuse.
- Cosmetic cleanup.

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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