[PATCH] [extra] pptrace - preprocessor tracing and testing tool

[John Thompson]

  I made one more change to the macro args formatting, as it could produce output with YAML symbols that will confuse a YAML parser.  I have it print tokens that are not identifiers or numbers by the results of their getName() call value, enclosed in '<' and '>'.

  I ran pp-trace over a full set of platform headers, including running yaml-bench over the output to check for valid YAML, with no errors.

  Though I still need to write tests for all the callback types, and user documentation, I think it might be ready for an initial checkin.

  -John

Hi silvas, kimgr,

http://llvm-reviews.chandlerc.com/D2020

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2020?vs=5256&id=5263#toc

Files:
  test/pp-trace/Input/Level1A.h
  test/pp-trace/Input/Level1B.h
  test/pp-trace/Input/Level2A.h
  test/pp-trace/pp-trace-macro.cpp
  test/pp-trace/pp-trace-include.cpp
  pp-trace/PPTrace.cpp
  pp-trace/PPCallbacksTracker.h
  pp-trace/PPCallbacksTracker.cpp
  pp-trace/CMakeLists.txt
  pp-trace/Makefile
  CMakeLists.txt
  Makefile
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