Reland "Return MaybeHandle from NewConsString."

src/func-name-inferrer.cc

Index: src/func-name-inferrer.cc
diff --git a/src/func-name-inferrer.cc b/src/func-name-inferrer.cc
index 441113b7d8de3ae272fcb156026f5cfd65ebd1e6..e85e89528297dd27092c1e20d2c132cbd4edc2c8 100644
--- a/src/func-name-inferrer.cc
+++ b/src/func-name-inferrer.cc
@@ -86,10 +86,9 @@ Handle<String> FuncNameInferrer::MakeNameFromStackHelper(int pos,
       Handle<String> name = names_stack_.at(pos).name;
       if (prev->length() + name->length() + 1 > String::kMaxLength) return prev;
       Factory* factory = isolate()->factory();
-      Handle<String> curr = factory->NewConsString(factory->dot_string(), name);
-      CHECK_NOT_EMPTY_HANDLE(isolate(), curr);
-      curr = factory->NewConsString(prev, curr);
-      CHECK_NOT_EMPTY_HANDLE(isolate(), curr);
+      Handle<String> curr =
+          factory->NewConsString(factory->dot_string(), name).ToHandleChecked();
+      curr = factory->NewConsString(prev, curr).ToHandleChecked();
       return MakeNameFromStackHelper(pos + 1, curr);
     } else {
       return MakeNameFromStackHelper(pos + 1, names_stack_.at(pos).name);