[PATCH] cpp11-migrate: Refactor for driver model of operation

[Edwin Vane]

Hi tareqsiraj, arielbernal, Sarcasm,

Massive simplification of how replacements and file overrides are
handled by the migrator:
* Sources and headers are all treated the same.
* All replacements for a given translation unit are stored in the same
  TranslationUnitReplacements structure.
* Change tracking is updated only from main file; no need for
  propagating "is tracking" flag around.
* Transform base class no longer responsible for applying replacements.
  They are simply stored and main() looks after deduplication and
  application.
* Renamed -yaml-only to -serialize-replacements. Same restrictions apply:
  Can only request one transform. New restriction: formatting cannot also
  be turned on since it's basically a transform.
* If -serialize-replacements is requested, changes to files will not be
  applied on disk.
* Changed behaviour of function generating names for serialized
  replacements: Only the main source file goes into the name of the file
  since a file may contain changes for multiple different files.
* Updated HeaderReplacements LIT test for new serialization behaviour.
  * Replaced old test that ensures replacements are not serialized if
    -serialize-replacements is not provided. New version ensures changes
    are made directly to all files in the translation unit.
* Updated unit tests.
  * Due to major simplification of structures in FileOverrides.h, the
    FileOverridesTest is quite a bit simpler now.

Depends on D1522.

http://llvm-reviews.chandlerc.com/D1545

Files:
  cpp11-migrate/AddOverride/AddOverride.cpp
  cpp11-migrate/AddOverride/AddOverride.h
  cpp11-migrate/AddOverride/AddOverrideActions.cpp
  cpp11-migrate/AddOverride/AddOverrideActions.h
  cpp11-migrate/CMakeLists.txt
  cpp11-migrate/Core/FileOverrides.cpp
  cpp11-migrate/Core/FileOverrides.h
  cpp11-migrate/Core/Refactoring.h
  cpp11-migrate/Core/Reformatting.cpp
  cpp11-migrate/Core/Reformatting.h
  cpp11-migrate/Core/SyntaxCheck.cpp
  cpp11-migrate/Core/Transform.cpp
  cpp11-migrate/Core/Transform.h
  cpp11-migrate/LoopConvert/LoopActions.cpp
  cpp11-migrate/LoopConvert/LoopActions.h
  cpp11-migrate/LoopConvert/LoopConvert.cpp
  cpp11-migrate/LoopConvert/LoopConvert.h
  cpp11-migrate/ReplaceAutoPtr/ReplaceAutoPtr.cpp
  cpp11-migrate/ReplaceAutoPtr/ReplaceAutoPtr.h
  cpp11-migrate/ReplaceAutoPtr/ReplaceAutoPtrActions.cpp
  cpp11-migrate/ReplaceAutoPtr/ReplaceAutoPtrActions.h
  cpp11-migrate/UseAuto/UseAuto.cpp
  cpp11-migrate/UseAuto/UseAuto.h
  cpp11-migrate/UseAuto/UseAutoActions.cpp
  cpp11-migrate/UseAuto/UseAutoActions.h
  cpp11-migrate/UseNullptr/NullptrActions.cpp
  cpp11-migrate/UseNullptr/NullptrActions.h
  cpp11-migrate/UseNullptr/UseNullptr.cpp
  cpp11-migrate/UseNullptr/UseNullptr.h
  cpp11-migrate/tool/CMakeLists.txt
  cpp11-migrate/tool/Cpp11Migrate.cpp
  test/cpp11-migrate/HeaderReplacements/Inputs/no_yaml.h
  test/cpp11-migrate/HeaderReplacements/common_expected.yaml
  test/cpp11-migrate/HeaderReplacements/main.cpp
  test/cpp11-migrate/HeaderReplacements/main_expected.yaml
  test/cpp11-migrate/HeaderReplacements/common.h.yaml
  test/cpp11-migrate/HeaderReplacements/no_yaml.cpp
  unittests/cpp11-migrate/CMakeLists.txt
  unittests/cpp11-migrate/FileOverridesTest.cpp
  unittests/cpp11-migrate/PerfSupportTest.cpp
  unittests/cpp11-migrate/ReformattingTest.cpp
  unittests/cpp11-migrate/TransformTest.cpp
  unittests/cpp11-migrate/UniqueHeaderNameTest.cpp
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