Fix GCC 4.7 warnings:

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 530 matching lines @@
       }
       break;
     case 3:
       AppendToBuffer("%s", (this->*register_name)(rm));
       return 1;
     default:
       UnimplementedInstruction();
       return 1;
   }
   UNREACHABLE();
+  return 1;

[Vyacheslav Egorov (Chromium), 2011/12/20 15:45:14]

and the same question again (default is present and all cases terminate with
returns).

 }
 
 
 int DisassemblerX64::PrintImmediate(byte* data, OperandSize size) {
   int64_t value;
   int count;
   switch (size) {
     case BYTE_SIZE:
       value = *data;
       count = 1;
@@ skipping 1280 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