[PATCH] Implement function prefix data as an IR feature.

[Peter Collingbourne]

    Rebased.

http://llvm-reviews.chandlerc.com/D1191

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1191?vs=3173&id=4050#toc

Files:
  docs/BitCodeFormat.rst
  docs/LangRef.rst
  include/llvm/IR/Function.h
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLToken.h
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Reader/BitcodeReader.h
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/Bitcode/Writer/ValueEnumerator.cpp
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/IR/AsmWriter.cpp
  lib/IR/Function.cpp
  lib/IR/LLVMContextImpl.h
  lib/IR/TypeFinder.cpp
  lib/Transforms/IPO/GlobalDCE.cpp
  test/CodeGen/X86/prefixdata.ll
  test/Feature/prefixdata.ll
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