[PATCH] Add profile writing capabilities for sampling profiles.

[Diego Novillo]

Address review feedback.

1- Use ErrorOr in readNumber/readString.
2- Remove local debugging code.
3- Other minor fixes.

http://reviews.llvm.org/D6000

Files:
  include/llvm/ProfileData/SampleProf.h
  include/llvm/ProfileData/SampleProfReader.h
  include/llvm/ProfileData/SampleProfWriter.h
  lib/ProfileData/CMakeLists.txt
  lib/ProfileData/SampleProf.cpp
  lib/ProfileData/SampleProfReader.cpp
  lib/ProfileData/SampleProfWriter.cpp
  lib/Transforms/Scalar/SampleProfile.cpp
  test/Transforms/SampleProfile/Inputs/fnptr.binprof
  test/Transforms/SampleProfile/Inputs/fnptr.prof
  test/Transforms/SampleProfile/fnptr.ll
  test/Transforms/SampleProfile/syntax.ll
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