Restrict immediate operands to smi where only smis are supported.

runtime/vm/disassembler_x64.cc

 // Copyright (c) 2012, 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_IA32.
 #if defined(TARGET_ARCH_X64)
 #include "platform/utils.h"
 #include "vm/allocation.h"
@@ skipping 591 matching lines @@
       mnem = "xor";
       break;
     case 7:
       mnem = "cmp";
       break;
     default:
       UnimplementedInstruction();
   }
   AppendToBuffer("%s%c ", mnem, operand_size_code());
   int count = PrintRightOperand(data + 1);
-  AppendToBuffer(",0x");
+  AppendToBuffer(",");
   OperandSize immediate_size = byte_size_immediate ? BYTE_SIZE : operand_size();
   count += PrintImmediate(data + 1 + count, immediate_size);
   return 1 + count;
 }
 
 
 // Returns number of bytes used, including *data.
 int DisassemblerX64::F6F7Instruction(uint8_t* data) {
   ASSERT(*data == 0xF7 || *data == 0xF6);
   uint8_t modrm = *(data + 1);
@@ skipping 1241 matching lines @@
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64