Merged: Avoid calling out to JS during stack overflow

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index cfb6860d978b1566005f430d7854bd224dc8e9bb..63c927b04c3a7b9392bdab3a7fdde631776faf31 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1735,6 +1735,9 @@ void Isolate::PopPromise() {
 bool Isolate::PromiseHasUserDefinedRejectHandler(Handle<Object> promise) {
   Handle<JSFunction> fun = promise_has_user_defined_reject_handler();
   Handle<Object> has_reject_handler;
+  // If we are, e.g., overflowing the stack, don't try to call out to JS
+  if (!AllowJavascriptExecution::IsAllowed(this)) return false;
+  // Call the registered function to check for a handler
   if (Execution::TryCall(this, fun, promise, 0, NULL)
           .ToHandle(&has_reject_handler)) {
     return has_reject_handler->IsTrue(this);