[PATCH] D18336: Prevent construction of cycle in DAG store merge

[Nirav Dave via llvm-commits]

niravd updated this revision to Diff 51612.
niravd added a comment.

Implement hasPredecessorHelper cleanup and merge two checks as per discussion
cleanup hasPredecessorHelper fixes and merge checks back together as per discussions


http://reviews.llvm.org/D18336

Files:
  include/llvm/CodeGen/SelectionDAGNodes.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/CodeGen/AArch64/vector_merge_dep_check.ll

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