[PATCH] Lower invoke statepoints and gc.results tied to them.

[Igor Laevsky]

Hi reames,

This change builds up on http://reviews.llvm.org/D7756

It teaches lowering to correctly handle invoke statepoint and gc results tied to them. Note that we still can not lower gc.results for invoke statepoints.
Also it extracts getCopyFromRegs helper function in SelectionDAGBuilder as we need to be able to customize type of the register exported from basic block during lowering of gc.result.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7760

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
  lib/CodeGen/SelectionDAG/StatepointLowering.cpp

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