[PATCH] R600/SI: Try to keep mul on SALU

[Matt Arsenault]

Also fix bug this exposed where when legalizing an immediate
operand, a v_mov_b32 would be created with a VSrc dest register.

http://reviews.llvm.org/D5134

Files:
  lib/Target/R600/SIInstrInfo.cpp
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/codegen-prepare-addrmode-sext.ll
  test/CodeGen/R600/mul.ll
  test/CodeGen/R600/sign_extend.ll
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