Fix for cmp and cmpi instruction in m16.igen

Defect report:-
-------------
File
-----
/src/sim/mips/m16.igen

Defects
--------

1. Mnemonic for CMP instruction is putted as

   "sltiu r<TRX>, r<TRY>"

   While it should be as

   "cmp r<TRX>, r<TRY>"

2. Mnemonic for CMPI instruction is putted as

   "sltiu r<TRX>, <IMMED>"

   While it should be as

   "cmpi r<TRX>, <IMMED>"

Patch
-----

GDB Version no:  6.0

File: /src/sim/mips/m16.igen

 11101,3.RX,3.RY,01010:RR:16::CMP
-"sltiu r<TRX>, r<TRY>"
+"cmp r<TRX>, r<TRY>"
 *mips16:
 *vr4100:
 {
   do_xor (SD_, TRX, TRY, T8IDX);
 }

 01110,3.RX,8.IMMED:RI:16::CMPI
-"sltiu r<TRX>, <IMMED>"
+"cmpi r<TRX>, <IMMED>"
 *mips16:
 *vr4100:
 {
   do_xori (SD_, TRX, T8IDX, IMMED);
 }