[mips] Addition of the [d]rem and [d]remu instructions

Related to http://reviews.llvm.org/D15772
Depends on http://reviews.llvm.org/D16889
Adds [D]REM[U] instructions.

Patch By: Srdjan Obucina
Contributions from: Simon Dardis

Differential Revision: https://reviews.llvm.org/D17036

llvm-svn: 336545