Skip back edge creation for "do ... while(false)" loops

src/ia32/disasm-ia32.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 989 matching lines @@
 
       case 0x81:  // fall through
       case 0x83:  // 0x81 with sign extension bit set
         data += PrintImmediateOp(data);
         break;
 
       case 0x0F:
         { byte f0byte = data[1];
           const char* f0mnem = F0Mnem(f0byte);
           if (f0byte == 0x18) {
+            data += 2;
             int mod, regop, rm;
             get_modrm(*data, &mod, &regop, &rm);
             const char* suffix[] = {"nta", "1", "2", "3"};
             AppendToBuffer("%s%s ", f0mnem, suffix[regop & 0x03]);
             data += PrintRightOperand(data);
           } else if (f0byte == 0x1F && data[2] == 0) {
             AppendToBuffer("nop");  // 3 byte nop.
             data += 3;
           } else if (f0byte == 0x1F && data[2] == 0x40 && data[3] == 0) {
             AppendToBuffer("nop");  // 4 byte nop.
@@ skipping 742 matching lines @@
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_IA32