[PATCH] Add small text file reader facility.

[Diego Novillo]

dnovillo added you to the CC list for the revision "Add small text file reader facility.".

Hi chandlerc,

This adds a new utility class in lib/Support: A class to read small
text files one line at a time. It's meant to be a very simple file
reading interface with support for keeping track of line numbers and
specifying a character to mark line comments.

The code has been factored out of the sample profiler pass.

OK to commit?

http://llvm-reviews.chandlerc.com/D2294

Files:
  include/llvm/Support/FileUtilities.h
  lib/Transforms/Scalar/SampleProfile.cpp
  test/Transforms/SampleProfile/syntax.ll
  unittests/Support/CMakeLists.txt
  unittests/Support/FileReaderTest.cpp
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