X64: Add parentheses to buggy expression in disassembler.

src/x64/disasm-x64.cc

 // Copyright 2009 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 1332 matching lines @@
         data += 2;
         break;
 
       case 0xA1:  // Fall through.
       case 0xA3:
         switch (operand_size()) {
           case DOUBLEWORD_SIZE: {
             const char* memory_location = NameOfAddress(
                 reinterpret_cast<byte*>(
                     *reinterpret_cast<int32_t*>(data + 1)));
-            if (*data & 0x2 == 0x2) {  // Opcode 0xA3
+            if (*data == 0xA3) {  // Opcode 0xA3
               AppendToBuffer("movzxlq rax,(%s)", memory_location);
             } else {  // Opcode 0xA1
               AppendToBuffer("movzxlq (%s),rax", memory_location);
             }
             data += 5;
             break;
           }
           case QUADWORD_SIZE: {
             // New x64 instruction mov rax,(imm_64).
             const char* memory_location = NameOfAddress(
                 *reinterpret_cast<byte**>(data + 1));
-            if (*data & 0x2 == 0x2) {  // Opcode 0xA3
+            if (*data == 0xA3) {  // Opcode 0xA3
               AppendToBuffer("movq rax,(%s)", memory_location);
             } else {  // Opcode 0xA1
               AppendToBuffer("movq (%s),rax", memory_location);
             }
             data += 9;
             break;
           }
           default:
             UnimplementedInstruction();
             data += 2;
@@ skipping 181 matching lines @@
       fprintf(f, "%02x", *bp);
     }
     for (int i = 6 - (pc - prev_pc); i >= 0; i--) {
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 }  // namespace disasm