[PATCH] Extend the check to detect patterns like 'ptr.get() == nullptr'

[Samuel Benzaquen]

Hi djasper,

Extend the check to detect patterns like 'ptr.get() == nullptr'
It detects == and != when any argument is a ptr.get() and the other is a
nullptr.
Only supports standard smart pointer types std::unique_ptr and std::shared_ptr.
Does not support the case 'ptr.get() == other.get()' yet.

http://llvm-reviews.chandlerc.com/D3294

Files:
  clang-tidy/misc/RedundantSmartptrGet.cpp
  test/clang-tidy/make_compile_commands_json.sh
  test/clang-tidy/redundant-smartptr-get-fix.cpp
  test/clang-tidy/redundant-smartptr-get.cpp
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