[mips][msa] Direct Object Emission support for BIT instructions.

List of instructions:
bclri.{b,h,w,d}
binsli.{b,h,w,d}
binsri.{b,h,w,d}
bnegi.{b,h,w,d}
bseti.{b,h,w,d}
sat_s.{b,h,w,d}
sat_u.{b,h,w,d}
slli.{b,h,w,d}
srai.{b,h,w,d}
srari.{b,h,w,d}
srli.{b,h,w,d}
srlri.{b,h,w,d}

llvm-svn: 192589