Renamed "symbols" to "internalized strings" throughout the code base,

src/x64/builtins-x64.cc

 // Copyright 2012 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 1621 matching lines @@
     __ push(rax);
     __ InvokeBuiltin(Builtins::TO_STRING, CALL_FUNCTION);
     __ pop(rdi);
   }
   __ movq(rbx, rax);
   __ jmp(&argument_is_string);
 
   // Load the empty string into rbx, remove the receiver from the
   // stack, and jump back to the case where the argument is a string.
   __ bind(&no_arguments);
-  __ LoadRoot(rbx, Heap::kEmptyStringRootIndex);
+  __ LoadRoot(rbx, Heap::kempty_stringRootIndex);
   __ pop(rcx);
   __ lea(rsp, Operand(rsp, kPointerSize));
   __ push(rcx);
   __ jmp(&argument_is_string);
 
   // At this point the argument is already a string. Call runtime to
   // create a string wrapper.
   __ bind(&gc_required);
   __ IncrementCounter(counters->string_ctor_gc_required(), 1);
   {
@@ skipping 182 matching lines @@
   Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR);
   generator.Generate();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64