[PATCH] [Instcombine/InstSimplify] Move optimization from instcombine to instsimplify

[Rahul Jain]

Hi Nick,

Thanks a lot for the review.
Updated patch as per your comment.
1) Sinked variable declarations next to their usage.
2) Folded if statements.
3) Added testcase.

Please help review the same.
If it looks good to you, please commit it for me. 
Soon will ask for commit access.

Thanks,
Rahul

http://reviews.llvm.org/D4100

Files:
  lib/Analysis/InstructionSimplify.cpp
  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  test/Transforms/InstSimplify/apint-or.ll
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