Add cvtsd2ss into X64 disassembler

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 1302 matching lines @@
     case 0x1F:
       return "nop";
     case 0x2A:  // F2/F3 prefix.
       return "cvtsi2s";
     case 0x51:  // F2 prefix.
       return "sqrtsd";
     case 0x58:  // F2 prefix.
       return "addsd";
     case 0x59:  // F2 prefix.
       return "mulsd";
+    case 0x5A:  // F2 prefix.
+      return "cvtsd2ss";
     case 0x5C:  // F2 prefix.
       return "subsd";
     case 0x5E:  // F2 prefix.
       return "divsd";
     case 0xA2:
       return "cpuid";
     case 0xA5:
       return "shld";
     case 0xAB:
       return "bts";
@@ skipping 550 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