[PATCH] Use ImmutableStatepoint during statepoint lowering.

[Igor Laevsky]

Hi reames,

This change is a first step towards lowering of an invoke statepoints. It moves statepoint lowering in a separate function 'LowerStatepoint' which uses ImmutableStatepoint instead of a CallInst. Also related utility functions are changed to receive ImmutableCallSite.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7756

Files:
  include/llvm/IR/Statepoint.h
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
  lib/CodeGen/SelectionDAG/StatepointLowering.cpp

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