[PATCH] Enable invoking the patchpoint intrinsic

[Kevin Modzelewski]

Hi ributzka, atrick,

Split into three commits:

Reduce code duplication between patchpoint and non-patchpoint lowering. NFC.
Enable invoking the patchpoint intrinsic
Fix an over-negation bug.

http://reviews.llvm.org/D5634

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
  lib/IR/Verifier.cpp
  test/CodeGen/X86/patchpoint-invoke.ll
  test/Verifier/invoke.ll
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