[PATCH] Introduce bitset metadata format and bitset lowering pass.

[Peter Collingbourne]

- Remove Int8Ty field.
- Add function comments
- Factor out some code into a function


http://reviews.llvm.org/D7288

Files:
  docs/BitSets.rst
  docs/LangRef.rst
  docs/index.rst
  include/llvm/ADT/EquivalenceClasses.h
  include/llvm/ADT/PointerUnion.h
  include/llvm/IR/Intrinsics.td
  include/llvm/InitializePasses.h
  include/llvm/Transforms/IPO.h
  include/llvm/Transforms/IPO/LowerBitSets.h
  lib/Transforms/IPO/CMakeLists.txt
  lib/Transforms/IPO/IPO.cpp
  lib/Transforms/IPO/LowerBitSets.cpp
  lib/Transforms/IPO/PassManagerBuilder.cpp
  test/Transforms/LowerBitSets/constant.ll
  test/Transforms/LowerBitSets/simple.ll
  test/Transforms/LowerBitSets/single-offset.ll
  unittests/Transforms/CMakeLists.txt
  unittests/Transforms/IPO/CMakeLists.txt
  unittests/Transforms/IPO/LowerBitSets.cpp
  unittests/Transforms/IPO/Makefile
  unittests/Transforms/Makefile

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