[PATCH] TableGen backend to generate an index in ctags(1) format.

[Kevin Schoedel]

  Thanks for the feedback.

  There doesn't seem to be a good way to identify which files to run llvm-tblgen on without involving the build system (or replicating information from it); that is not done for normal C++ tags, so I didn't want to do it here. (This is not a problem from ctags(1), which merely scans individual source files and does not require them to be buildable.)  The added script tries to guess reasonably well, and can be told to shut tblgen up in the cases it gets wrong.

  Tested on Linux and OS X.

http://llvm-reviews.chandlerc.com/D546

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D546?vs=1301&id=1308#toc

Files:
  utils/TableGen/CMakeLists.txt
  utils/TableGen/CTagsEmitter.cpp
  utils/TableGen/TableGen.cpp
  utils/TableGen/TableGenBackends.h
  utils/TableGen/tdtags
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