Revert of [es2015] Precompute the descriptive string for symbols.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 80caf0a426c22fe8b6df3c25e5b417af4594e168..330174e79a2f6c4fd73aa1d22e6b2194b244bd2e 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -8051,14 +8051,8 @@
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   LOG_API(i_isolate, Symbol, New);
   ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
-  i::Handle<i::Symbol> result;
-  i::Handle<i::Object> i_name =
-      name.IsEmpty()
-          ? i::Handle<i::Object>::cast(i_isolate->factory()->undefined_value())
-          : i::Handle<i::Object>::cast(Utils::OpenHandle(*name));
-  if (!i_isolate->factory()->NewSymbol(i_name).ToHandle(&result)) {
-    i::FatalProcessOutOfMemory("v8::Symbol::New");
-  }
+  i::Handle<i::Symbol> result = i_isolate->factory()->NewSymbol();
+  if (!name.IsEmpty()) result->set_name(*Utils::OpenHandle(*name));
   return Utils::ToLocal(result);
 }
 
@@ -8105,16 +8099,10 @@
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   LOG_API(i_isolate, Private, New);
   ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
-  i::Handle<i::Symbol> result;
-  i::Handle<i::Object> i_name =
-      name.IsEmpty()
-          ? i::Handle<i::Object>::cast(i_isolate->factory()->undefined_value())
-          : i::Handle<i::Object>::cast(Utils::OpenHandle(*name));
-  if (!i_isolate->factory()->NewPrivateSymbol(i_name).ToHandle(&result)) {
-    i::FatalProcessOutOfMemory("v8::Private::New");
-  }
-  return v8::Local<Private>(
-      reinterpret_cast<Private*>(*Utils::ToLocal(result)));
+  i::Handle<i::Symbol> symbol = i_isolate->factory()->NewPrivateSymbol();
+  if (!name.IsEmpty()) symbol->set_name(*Utils::OpenHandle(*name));
+  Local<Symbol> result = Utils::ToLocal(symbol);
+  return v8::Local<Private>(reinterpret_cast<Private*>(*result));
 }