Fix x64 build.

src/x64/codegen-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 355 matching lines @@
 }
 
 void CodeGenerator::GenerateLog(ZoneList<Expression*>* a) {
   UNIMPLEMENTED();
 }
 
 void CodeGenerator::GenerateObjectEquals(ZoneList<Expression*>* a) {
   UNIMPLEMENTED();
 }
 
+void CodeGenerator::GenerateRandomPositiveSmi(ZoneList<Expression*>* a) {
+  UNIMPLEMENTED();
+}
+
 void CodeGenerator::GenerateSetValueOf(ZoneList<Expression*>* a) {
   UNIMPLEMENTED();
 }
 
 void CodeGenerator::GenerateValueOf(ZoneList<Expression*>* a) {
   UNIMPLEMENTED();
 }
 
 #undef __
 // End of CodeGenerator implementation.
@@ skipping 346 matching lines @@
 
   // Restore frame pointer and return.
   __ pop(rbp);
   __ ret(0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal