Add remaining @@toStringTag symbols to builtins

src/runtime/runtime-function.cc

Index: src/runtime/runtime-function.cc
diff --git a/src/runtime/runtime-function.cc b/src/runtime/runtime-function.cc
index b57064f364fedf5753bbad76a39fd619849c1c68..e25b6592e00130ffb52f7d5157af2048e487bde8 100644
--- a/src/runtime/runtime-function.cc
+++ b/src/runtime/runtime-function.cc
@@ -67,13 +67,32 @@ RUNTIME_FUNCTION(Runtime_FunctionGetName) {
 }
 
 
+static Handle<String> NameToFunctionName(Handle<Name> name) {
+  Handle<String> stringName(name->GetHeap()->empty_string());
+
+  // TODO(caitp): Follow proper rules in section 9.2.11 (SetFunctionName)
+  if (name->IsSymbol()) {
+    Handle<Object> description(Handle<Symbol>::cast(name)->name(),
+                               name->GetIsolate());
+    if (description->IsString()) {
+      stringName = Handle<String>::cast(description);
+    }
+  } else {
+    stringName = Handle<String>::cast(name);
+  }
+
+  return stringName;
+}
+
+
 RUNTIME_FUNCTION(Runtime_FunctionSetName) {
-  SealHandleScope shs(isolate);
+  HandleScope scope(isolate);
   DCHECK(args.length() == 2);
 
-  CONVERT_ARG_CHECKED(JSFunction, f, 0);
-  CONVERT_ARG_CHECKED(String, name, 1);
-  f->shared()->set_name(name);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, f, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
+
+  f->shared()->set_name(*NameToFunctionName(name));
   return isolate->heap()->undefined_value();
 }