[PATCH] Add function entry count metadata.

[Diego Novillo]

- Add documentation for function_entry_count counter.


http://reviews.llvm.org/D9628

Files:
  docs/BranchWeightMetadata.rst
  include/llvm/IR/Function.h
  include/llvm/IR/MDBuilder.h
  lib/IR/Function.cpp
  lib/IR/MDBuilder.cpp
  lib/IR/Verifier.cpp
  test/Verifier/function-metadata.ll
  unittests/IR/MetadataTest.cpp

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