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

[Sanjay Patel]

Hi samsonov, nadav, hfinkel,

This is a 2nd try at the same optimization as http://reviews.llvm.org/D6698. That patch was checked in at r224611, but reverted at r225031 because it caused a failure. 

The cause of the crash was not recognizing consecutive stores that have mixed source values (loads and vector element extracts), so I've just added a check to bail out if any store value is not coming from a vector element extract.

http://reviews.llvm.org/D6850

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

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