[PATCH] Add function entry count metadata.

[Diego Novillo]

This update includes the following changes:

- Return Optional<uint64_t> from getEntryCount to indicate whether a count is available.
- Move setEntrycount() and getEntryCount() to lib/IR/Function.cpp.
- Remove @brief from comments.
- Add IR verification to !prof nodes and tests.


http://reviews.llvm.org/D9628

Files:
  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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