[PATCH] Don't replace macro usage if macro body has NULL

[Tareq A. Siraj]

  Changes based on review.

  - Include file sorted.
  - Order of comparion with constants fixed.
  - CHECK line fixed.
  - Addressed the question when macro caller is a macro id.
  - Added more testcases.

Hi klimek, revane,

http://llvm-reviews.chandlerc.com/D549

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D549?vs=1307&id=1310#toc

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