[PATCH] Add small text file reader facility.

[Diego Novillo]

  This fixes support for comment lines. The iterator completely skips over them, instead of uselessly stopping at each one.

Hi chandlerc,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2294?vs=5954&id=5967#toc

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