[PATCH] [mips] Enable arithmetic and binary operations for the i128 data type.

[Vasileios Kalintiris]

Hi dsanders,

This patch adds support for some operations that were missing from
128-bit integer types (add/sub/mul/sdiv/udiv... etc.). With these
changes we can support the __int128_t and __uint128_t data types
from C/C++.

Depends on D7125

http://reviews.llvm.org/D7143

Files:
  lib/Target/Mips/Mips64InstrInfo.td
  lib/Target/Mips/MipsISelLowering.cpp
  lib/Target/Mips/MipsSEISelDAGToDAG.cpp
  lib/Target/Mips/MipsSEISelLowering.cpp
  test/CodeGen/Mips/llvm-ir/add.ll
  test/CodeGen/Mips/llvm-ir/and.ll
  test/CodeGen/Mips/llvm-ir/ashr.ll
  test/CodeGen/Mips/llvm-ir/lshr.ll
  test/CodeGen/Mips/llvm-ir/mul.ll
  test/CodeGen/Mips/llvm-ir/or.ll
  test/CodeGen/Mips/llvm-ir/sdiv.ll
  test/CodeGen/Mips/llvm-ir/shl.ll
  test/CodeGen/Mips/llvm-ir/srem.ll
  test/CodeGen/Mips/llvm-ir/sub.ll
  test/CodeGen/Mips/llvm-ir/udiv.ll
  test/CodeGen/Mips/llvm-ir/urem.ll
  test/CodeGen/Mips/llvm-ir/xor.ll

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