Fix wrong asserts from r3554

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 3884 matching lines @@
   Load(args->at(0));
   Load(args->at(1));
 
   StringAddStub stub(NO_STRING_ADD_FLAGS);
   Result answer = frame_->CallStub(&stub, 2);
   frame_->Push(&answer);
 }
 
 
 void CodeGenerator::GenerateSubString(ZoneList<Expression*>* args) {
-  ASSERT_EQ(2, args->length());
+  ASSERT_EQ(3, args->length());
 
   Load(args->at(0));
   Load(args->at(1));
   Load(args->at(2));
 
   Result answer = frame_->CallRuntime(Runtime::kSubString, 3);
   frame_->Push(&answer);
 }
 
 
@@ skipping 4146 matching lines @@
   masm.GetCode(&desc);
   // Call the function from C++.
   return FUNCTION_CAST<ModuloFunction>(buffer);
 }
 
 #endif
 
 #undef __
 
 } }  // namespace v8::internal