[PATCH] Teach instcombine to canonicalize "element extraction" from a load of an integer and "element insertion" into a store of an integer into actual element extraction, element insertion, and vector loads and stores.

[Chandler Carruth]

Fix a somewhat obvious goof with endianness and a bunch of formatting badness
that drifted into the patch.

Update the test case to be much more precise about what it checks and to
enforce that we get endianness correct now.

http://reviews.llvm.org/D6548

Files:
  lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
  test/Transforms/InstCombine/loadstore-vector.ll
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