[mips][microMIPS] Implement microMIPS 16-bit instructions registers
Differential Revision: http://reviews.llvm.org/D5116


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220273 91177308-0d34-0410-b5e6-96231b3b80d8
[mips][microMIPS] Implement AND16, NOT16, OR16 and XOR16 instructions
Differential Revision: http://reviews.llvm.org/D5117


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220275 91177308-0d34-0410-b5e6-96231b3b80d8
[mips][microMIPS] Implement ADDU16 and SUBU16 instructions
Differential Revision: http://reviews.llvm.org/D5118


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220276 91177308-0d34-0410-b5e6-96231b3b80d8