[PATCH] Initial code coverage mapping data, reader, writer + C interface for ProfileData

[Alex Lorenz]

Thanks again for the review, I've implemented the suggested changes. I also merged the coverage mapping data into one section - this reduced the object file size for the test programs by 4.5% on average.

http://reviews.llvm.org/D4301

Files:
  include/llvm/ProfileData/CoverageMapping.h
  include/llvm/ProfileData/CoverageMappingReader.h
  include/llvm/ProfileData/CoverageMappingWriter.h
  lib/ProfileData/CMakeLists.txt
  lib/ProfileData/CoverageMapping.cpp
  lib/ProfileData/CoverageMappingReader.cpp
  lib/ProfileData/CoverageMappingWriter.cpp
  lib/ProfileData/LLVMBuild.txt
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