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

[Peter Collingbourne]

This also introduces a couple of optimizations which yielded a binary size
improvement of about 0.5% in a certain medium size (~14MB) binary.

- Enforce availability of data layout
- Check if the pointer is statically a member of the bitset; if so, remove the check
- Add fast check for case where bitset contains single element
- Use SmallVector


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
  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

EMAIL PREFERENCES
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