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

[Alex Lorenz]

The updated version of the patch that fixes various typos, adds format version to the coverage mapping format, changes the storage of filenames to once per tu, and adds document that describes the actual coverage mapping format.

http://reviews.llvm.org/D4301

Files:
  docs/CoverageMappingFormat.rst
  docs/index.rst
  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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