Fixed x64 disassembler for cmpb_al

src/x64/disasm-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1706 matching lines @@
       case 0xEB:
         data += JumpShort(data);
         break;
 
       case 0xF6:
         byte_size_operand_ = true;  // fall through
       case 0xF7:
         data += F6F7Instruction(data);
         break;
 
+      case 0x3C:
+        AppendToBuffer("cmp al, 0x%x", *reinterpret_cast<int8_t*>(data + 1));
+        data +=2;
+        break;
+
       default:
         UnimplementedInstruction();
         data += 1;
     }
   }  // !processed
 
   if (tmp_buffer_pos_ < sizeof tmp_buffer_) {
     tmp_buffer_[tmp_buffer_pos_] = '\0';
   }
 
@@ skipping 111 matching lines @@
     for (int i = 6 - static_cast<int>(pc - prev_pc); i >= 0; i--) {
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_X64