[PATCH] [DAGCombine] Fix bug in MergeConsecutiveStores

[Akira Hatanaka]

When the target is x86-64, DAGCombiner::MergeStoresOfConstantsOrVecElts returns early because v2f32 is not a legal vector type for x86-64.

I've updated the comments and simplified the test case a little as per Sanjay's request.


http://reviews.llvm.org/D8849

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/merge-store.ll
  test/CodeGen/X86/2012-11-28-merge-store-alias.ll

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