[PATCH] Add show and merge tools for sample PGO profiles.

[Diego Novillo]

- Use range-for iteration.
- Fix flag check for --all-functions and --function in llvm-profdata.

http://reviews.llvm.org/D6065

Files:
  include/llvm/ProfileData/SampleProf.h
  include/llvm/ProfileData/SampleProfReader.h
  include/llvm/ProfileData/SampleProfWriter.h
  lib/ProfileData/SampleProf.cpp
  lib/ProfileData/SampleProfReader.cpp
  lib/ProfileData/SampleProfWriter.cpp
  test/tools/llvm-profdata/Inputs/sample-profile.proftext
  test/tools/llvm-profdata/sample-profile-basic.test
  tools/llvm-profdata/llvm-profdata.cpp
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