ES6 symbols: fix corner cases of equality operators

src/objects.cc

 // Copyright 2013 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 80 matching lines @@
     Context* native_context = isolate->context()->native_context();
     return CreateJSValue(native_context->number_function(), this);
   } else if (IsBoolean()) {
     Isolate* isolate = HeapObject::cast(this)->GetIsolate();
     Context* native_context = isolate->context()->native_context();
     return CreateJSValue(native_context->boolean_function(), this);
   } else if (IsString()) {
     Isolate* isolate = HeapObject::cast(this)->GetIsolate();
     Context* native_context = isolate->context()->native_context();
     return CreateJSValue(native_context->string_function(), this);
+  } else if (IsSymbol()) {
+    Isolate* isolate = HeapObject::cast(this)->GetIsolate();
+    Context* native_context = isolate->context()->native_context();
+    return CreateJSValue(native_context->symbol_function(), this);
   }
 
   // Throw a type error.
   return Failure::InternalError();
 }
 
 
 bool Object::BooleanValue() {
   if (IsBoolean()) return IsTrue();
   if (IsSmi()) return Smi::cast(this)->value() != 0;
@@ skipping 14245 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal