[PATCH] LoopStrengthReduce: Try to pass address space to isLegalAddressingMode

[Matt Arsenault]

This seems to only work some of the time. In some situations,
this seems to use a nonsensical type and isn't actually aware of the
memory being accessed. e.g. if branch condition is an icmp of a pointer,
it checks the addressing mode of i1.

http://reviews.llvm.org/D10289

Files:
  lib/Transforms/Scalar/LoopStrengthReduce.cpp
  test/Transforms/LoopStrengthReduce/R600/different-addrspace-addressing-mode-loops.ll
  test/Transforms/LoopStrengthReduce/R600/lit.local.cfg
  test/Transforms/LoopStrengthReduce/R600/lsr-postinc-pos-addrspace.ll

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