[PATCH] Statepoint infrastructure for garbage collection

[Philip Reames]

Revised to include changes requested by reviewers.  Andy, Juergen, can I get a LGTM here?  If you have additional comments, I'm happy to keep making changes once in tree, but keeping the diffs up to date and clean is becoming a real pain.

p.s. This is *not* against TOT.  I had to include one change from TOT (in IR/Functions.cpp) to cleanup some now redundant code, but this is otherwise based on the same revision as previous.  I will of course rebase before submission.

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/CMakeLists.txt
  lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
  lib/CodeGen/SelectionDAG/StatepointLowering.cpp
  lib/CodeGen/SelectionDAG/StatepointLowering.h
  lib/CodeGen/StackMaps.cpp
  lib/CodeGen/TargetLoweringBase.cpp
  lib/IR/CMakeLists.txt
  lib/IR/Function.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.ll
  utils/TableGen/CodeGenTarget.cpp
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