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

[John Thompson]

  Thanks, Kim, for the excellent review, and also for solving the walking issue. I've applied the suggested changes, revised the MacroArgs argument walking code segment, and added another test.

  More tests will follow, but first I'm going to run the tool over a set of platform headers, to see if I can ring out any more crashes.

  -John

Hi silvas, kimgr,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2020?vs=5233&id=5256#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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