[PATCH] Move ownership of GCStrategy objects to LLVMContext

[Philip Reames]

Updates based on Chandlers comments.  GCStrategy is completely moved into IR.  I haven't gone through and fixed all the comments yet, but will do so once this lands.

Note that this is dependent on http://reviews.llvm.org/D7004 and that supporting refactoring (splitting GCStrategy.cpp into two files) already landing.

I would also like to get rid of the performCustomLowering mechanism, but that should not block this and will require a bit more thought.


http://reviews.llvm.org/D6811

Files:
  include/llvm/CodeGen/GCMetadata.h
  include/llvm/CodeGen/GCMetadataPrinter.h
  include/llvm/CodeGen/GCStrategy.h
  include/llvm/IR/Function.h
  include/llvm/IR/GCStrategy.h
  lib/CodeGen/ErlangGC.cpp
  lib/CodeGen/GCMetadata.cpp
  lib/CodeGen/GCRootLowering.cpp
  lib/CodeGen/GCStrategy.cpp
  lib/CodeGen/OcamlGC.cpp
  lib/CodeGen/Passes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
  lib/CodeGen/SelectionDAG/StatepointLowering.cpp
  lib/CodeGen/ShadowStackGC.cpp
  lib/CodeGen/StatepointExampleGC.cpp
  lib/IR/Function.cpp
  lib/IR/GCStrategy.cpp
  lib/IR/LLVMContextImpl.cpp
  lib/IR/LLVMContextImpl.h

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