[PATCH] Refactor UseNullptr matcher to avoid duplication

[Ariel Bernal]

  Added test case from PR15572 and fixed a typo.

Hi revane, tareqsiraj,

http://llvm-reviews.chandlerc.com/D604

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D604?vs=1468&id=1469#toc

Files:
  cpp11-migrate/UseNullptr/NullptrActions.cpp
  cpp11-migrate/UseNullptr/NullptrActions.h
  cpp11-migrate/UseNullptr/NullptrMatchers.cpp
  cpp11-migrate/UseNullptr/NullptrMatchers.h
  cpp11-migrate/UseNullptr/UseNullptr.cpp
  test/cpp11-migrate/UseNullptr/macros.cpp
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