[PATCH] Allow bitcast + struct GEP transform to work with addrspacecast

[Matt Arsenault]

Make getelementptr (addrspacecast (bitcast X)) behave similarly to getelementptr (bitcast X)

http://reviews.llvm.org/D4509

Files:
  lib/Transforms/InstCombine/InstructionCombining.cpp
  test/Transforms/InstCombine/cast.ll
  test/Transforms/InstCombine/getelementptr.ll
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