[PATCH] Simplify format of profile input file.

[Diego Novillo]

  This update incorporates the removal of the FileReader class.
  Instead, the patch now uses the new line_iterator class.

Hi chandlerc,

http://llvm-reviews.chandlerc.com/D2419

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2419?vs=6129&id=6378#toc

Files:
  include/llvm/Support/FileUtilities.h
  lib/Transforms/Scalar/SampleProfile.cpp
  test/Transforms/SampleProfile/Inputs/bad_fn_header.prof
  test/Transforms/SampleProfile/Inputs/bad_sample_line.prof
  test/Transforms/SampleProfile/Inputs/branch.prof
  test/Transforms/SampleProfile/Inputs/calls.prof
  test/Transforms/SampleProfile/Inputs/missing_num_syms.prof
  test/Transforms/SampleProfile/Inputs/missing_samples.prof
  test/Transforms/SampleProfile/Inputs/missing_symtab.prof
  test/Transforms/SampleProfile/Inputs/propagate.prof
  test/Transforms/SampleProfile/Inputs/syntax.prof
  test/Transforms/SampleProfile/syntax.ll
  unittests/Support/CMakeLists.txt
  unittests/Support/FileReaderTest.cpp
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