Return MaybeHandle from Invoke.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 492e97e85ae3c2d5c85ca60d973ef5d0e487f0d8..94fee79b7658556788f4dc5f23e12ac91b7caed6 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1131,10 +1131,9 @@ void Isolate::DoThrow(Object* exception, MessageLocation* location) {
       // before throwing as uncaught exception.  Note that the pending
       // exception object to be set later must not be turned into a string.
       if (exception_arg->IsJSObject() && !IsErrorObject(exception_arg)) {
-        bool failed = false;
-        exception_arg =
-            Execution::ToDetailString(this, exception_arg, &failed);
-        if (failed) {
+        MaybeHandle<Object> maybe_exception =
+            Execution::ToDetailString(this, exception_arg);
+        if (!maybe_exception.ToHandle(&exception_arg)) {
           exception_arg = factory()->InternalizeOneByteString(
               STATIC_ASCII_VECTOR("exception"));
         }