[PATCH] [mips] Enable code generation for the MIPS II target.

[Vasileios Kalintiris]

Hi dsanders,

This patch enables code generation for the MIPS II target. Pre-Mips32
targets don't have the MUL instruction, so we add the correspondent
pattern that uses the MULT/MFLO combination in order to retrieve the
product.

This is WIP as we don't support code generation for select nodes due to
the lack of conditional-move instructions.

http://reviews.llvm.org/D6150

Files:
  lib/Target/Mips/MipsInstrInfo.td
  lib/Target/Mips/MipsSubtarget.cpp
  lib/Target/Mips/MipsSubtarget.h
  test/CodeGen/Mips/llvm-ir/mul.ll
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