Add logical ops to Mips fast-isel
Code is mostly copied from AArch64 port and modified where needed for Mips.
This handles the "non" legal cases of logical ops. Legal cases are handled by tablegen patterns.
Make check test logopm.ll
All of test-suite passes at O0/O2 and mips32 r1/r2 with this new change.
Reviewed By: dsanders
Subscribers: echristo, llvm-commits, aemerson, rfuhler
Differential Revision: http://reviews.llvm.org/D6599