[PATCH] Statepoint infrastructure for garbage collection

[Philip Reames]

Updating statepoint changes to:
- include some reasonable documentation.  What's here still needs serious work, but at least it's reasonable complete and doesn't contain obvious errors.  
- remove the hack to use Indirect vs Direct locations.  
- rebase on TOT

http://reviews.llvm.org/D5683

Files:
  docs/Statepoints.rst
  include/llvm/CodeGen/FunctionLoweringInfo.h
  include/llvm/CodeGen/MachineInstr.h
  include/llvm/CodeGen/StackMaps.h
  include/llvm/IR/Intrinsics.td
  include/llvm/IR/Statepoint.h
  include/llvm/Target/Target.td
  include/llvm/Target/TargetFrameLowering.h
  include/llvm/Target/TargetOpcodes.h
  lib/Analysis/TargetTransformInfo.cpp
  lib/CodeGen/InlineSpiller.cpp
  lib/CodeGen/LocalStackSlotAllocation.cpp
  lib/CodeGen/PrologEpilogInserter.cpp
  lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
  lib/CodeGen/StackMaps.cpp
  lib/CodeGen/TargetLoweringBase.cpp
  lib/IR/CMakeLists.txt
  lib/IR/Function.cpp
  lib/IR/LLVMContext.cpp
  lib/IR/Statepoint.cpp
  lib/IR/Verifier.cpp
  lib/Target/X86/X86FrameLowering.cpp
  lib/Target/X86/X86FrameLowering.h
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86MCInstLower.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/CodeGen/X86/statepoint-call-lowering.ll
  test/CodeGen/X86/statepoint-stack-usage.ll
  test/CodeGen/X86/statepoint-stackmap-format.ll
  test/Verifier/statepoint-non-gc-ptr.ll
  test/Verifier/statepoint.ll
  utils/TableGen/CodeGenTarget.cpp
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