Don't wrap roots in Handle just to dereference immediately.

src/messages.cc

Index: src/messages.cc
diff --git a/src/messages.cc b/src/messages.cc
index aa878eede6c16af97ab56a10f200ed27acd8021b..2726055c2ca8bdab7a43a28965105d0921413eac 100644
--- a/src/messages.cc
+++ b/src/messages.cc
@@ -301,7 +301,7 @@ namespace {
 
 Object* EvalFromFunctionName(Isolate* isolate, Handle<Script> script) {
   if (script->eval_from_shared()->IsUndefined(isolate))
-    return *isolate->factory()->undefined_value();
+    return isolate->heap()->undefined_value();
 
   Handle<SharedFunctionInfo> shared(
       SharedFunctionInfo::cast(script->eval_from_shared()));
@@ -315,13 +315,13 @@ Object* EvalFromFunctionName(Isolate* isolate, Handle<Script> script) {
 
 Object* EvalFromScript(Isolate* isolate, Handle<Script> script) {
   if (script->eval_from_shared()->IsUndefined(isolate))
-    return *isolate->factory()->undefined_value();
+    return isolate->heap()->undefined_value();
 
   Handle<SharedFunctionInfo> eval_from_shared(
       SharedFunctionInfo::cast(script->eval_from_shared()));
   return eval_from_shared->script()->IsScript()
              ? eval_from_shared->script()
-             : *isolate->factory()->undefined_value();
+             : isolate->heap()->undefined_value();
 }
 
 MaybeHandle<String> FormatEvalOrigin(Isolate* isolate, Handle<Script> script) {