[PATCH] Allow users to specify NULL like macros to be replaced

[Tareq A. Siraj]

Hi revane, klimek,

-use-nullptr only replaced macro named NULL and ignored any user defined
macros that behaved like NULL. This patch introduces -user-null-macros
command line option to let users specify their custom NULL like macros.

- Added a -user-null-macros command line option that takes a
  comma-separated list of user defined macros to be replaced when using
  the -use-nullptr transform.
- Added documentation.
- Updated testcase to reflect current behavior.
- Whitespace fixes.

http://llvm-reviews.chandlerc.com/D574

Files:
  cpp11-migrate/Transforms.h
  cpp11-migrate/UseNullptr/NullptrActions.cpp
  cpp11-migrate/UseNullptr/NullptrActions.h
  docs/UseNullptrTransform.rst
  docs/cpp11-migrate.rst
  test/cpp11-migrate/UseNullptr/macros.cpp
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