[PATCH] merge consecutive stores of extracted vector elements (PR21711)

[Sanjay Patel]

Ping.

Updated comment to hopefully better explain the mixed source case that is not currently handled.


http://reviews.llvm.org/D6850

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/MergeConsecutiveStores.ll

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