Adds simulator debugger and Stop to arm64.

runtime/vm/disassembler_arm64.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 #include "platform/assert.h"
 
@@ skipping 852 matching lines @@
   if (instr->IsDPImmediateOp()) {
     DecodeDPImmediate(instr);
   } else if (instr->IsCompareBranchOp()) {
     DecodeCompareBranch(instr);
   } else if (instr->IsLoadStoreOp()) {
     DecodeLoadStore(instr);
   } else if (instr->IsDPRegisterOp()) {
     DecodeDPRegister(instr);
   } else if (instr->IsDPSimd1Op()) {
     DecodeDPSimd1(instr);
+  } else if (instr->IsDPSimd2Op()) {
+    DecodeDPSimd2(instr);
   } else {
-    ASSERT(instr->IsDPSimd2Op());
-    DecodeDPSimd2(instr);
+    Unknown(instr);
   }
 }
 
 
 void Disassembler::DecodeInstruction(char* hex_buffer, intptr_t hex_size,
                                      char* human_buffer, intptr_t human_size,
                                      int* out_instr_size, uword pc) {
   ARM64Decoder decoder(human_buffer, human_size);
   decoder.InstructionDecode(pc);
   int32_t instruction_bits = Instr::At(pc)->InstructionBits();
@@ skipping 32 matching lines @@
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM