[PATCH] Add FileCheck -implicit-check-not option to allow stricter tests without adding too many CHECK-NOTs manually.

[Alexander Kornienko]

Added tests and documentation for -implicit-check-not.

http://reviews.llvm.org/D4462

Files:
  docs/CommandGuide/FileCheck.rst
  test/FileCheck/implicit-check-not.txt
  utils/FileCheck/FileCheck.cpp
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