[PATCH] R600/SI: Implement areLoadsFromSameBasePtr

[Matt Arsenault]

This currently has a noticable effect on the kernel argument loads.
LDS and global loads are more problematic, I think because of how copies 
are currently inserted to ensure that the address is a VGPR.

http://reviews.llvm.org/D4712

Files:
  lib/Target/R600/SIInstrInfo.cpp
  lib/Target/R600/SIInstrInfo.h
  test/CodeGen/R600/address-space.ll
  test/CodeGen/R600/atomic_cmp_swap_local.ll
  test/CodeGen/R600/ctpop64.ll
  test/CodeGen/R600/cvt_f32_ubyte.ll
  test/CodeGen/R600/extract_vector_elt_i16.ll
  test/CodeGen/R600/fcopysign.f32.ll
  test/CodeGen/R600/fcopysign.f64.ll
  test/CodeGen/R600/llvm.memcpy.ll
  test/CodeGen/R600/mubuf.ll
  test/CodeGen/R600/rotl.i64.ll
  test/CodeGen/R600/schedule-global-loads.ll
  test/CodeGen/R600/schedule-kernel-arg-loads.ll
  test/CodeGen/R600/trunc.ll
  test/CodeGen/R600/wait.ll
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