MIPS64: Fix code generator and simulator for DEXTM.

src/mips64/disasm-mips64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A Disassembler object is used to disassemble a block of code instruction by
 // instruction. The default implementation of the NameConverter object can be
 // overriden to modify register names or to do symbol lookup on addresses.
 //
 // The example below will disassemble a block of code and print it to stdout.
 //
@@ skipping 1455 matching lines @@
       break;
     }
     case EXT: {
       Format(instr, "ext     'rt, 'rs, 'sa, 'ss1");
       break;
     }
     case DEXT: {
       Format(instr, "dext    'rt, 'rs, 'sa, 'ss1");
       break;
     }
+    case DEXTM: {
+      Format(instr, "dextm   'rt, 'rs, 'sa, 'ss1");
+      break;
+    }
+    case DEXTU: {
+      Format(instr, "dextu   'rt, 'rs, 'sa, 'ss1");
+      break;
+    }
     case BSHFL: {
       int sa = instr->SaFieldRaw() >> kSaShift;
       switch (sa) {
         case BITSWAP: {
           Format(instr, "bitswap 'rd, 'rt");
           break;
         }
         case SEB: {
           Format(instr, "seb     'rd, 'rt");
           break;
@@ skipping 557 matching lines @@
                          *reinterpret_cast<int32_t*>(prev_pc), buffer.start());
   }
 }
 
 
 #undef UNSUPPORTED
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_MIPS64