[PATCH] Make SROA handle addrspacecast

[Xuetian Weng]

Hi arsenm, chandlerc,

This is basically D4501 from Matt with fixed testcase. In GPU related
world addrspacecast instructions are commonly used to avoid overhead
when access memory with generic load and store. SROA pass currently does
not take addrspaceCast into account. This patch uses the same way that SROA
handles bitcast to process addrspacecast.

http://reviews.llvm.org/D10482

Files:
  include/llvm/Analysis/PtrUseVisitor.h
  lib/Transforms/Scalar/SROA.cpp
  test/Transforms/SROA/basictest.ll

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