[PATCH] R600/SI: Prefer selecting more e64 instruction forms.

[Matt Arsenault]

Add some more tests to make sure better operand
choices are still made. Leave some cases that seem
to have no reason to ever be e64 alone.

http://reviews.llvm.org/D5246

Files:
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/and.ll
  test/CodeGen/R600/bfi_int.ll
  test/CodeGen/R600/ctpop.ll
  test/CodeGen/R600/llvm.AMDGPU.rsq.ll
  test/CodeGen/R600/rsq.ll
  test/CodeGen/R600/trunc.ll
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