[PATCH] Add small text file reader facility.

[Diego Novillo]

  This revision converts FileReader into an iterator class. I've updated
  the test cases and the existing user in SampleProfile.cpp.

Hi chandlerc,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2294?vs=5829&id=5881#toc

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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