[PATCH] [InstCombine] Fold endian-independent load sequence into a single load.

[Ahmed Bougacha]

Address Hal's comments:
- bail out early if the byte load instruction isn't in the same block as the shift
- query AA instead of bailing out for all stores

Also, test that the unaligned folded load is made to be aligned  (this is done by other InstCombines, but it's pretty important for this; I can remove the test if desired)

http://reviews.llvm.org/D5898

Files:
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  test/Transforms/InstCombine/endian-independent-load-BE.ll
  test/Transforms/InstCombine/endian-independent-load-LE-aliasing.ll
  test/Transforms/InstCombine/endian-independent-load-LE.ll
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