Bug 1770048: Add testcase r=tcampbell

Differential Revision: https://phabricator.services.mozilla.com/D146746

js/src/jit-test/tests/modules/bug1770048.js

@@ -0,0 +1,20 @@
+const m1 = parseModule(`
+  export let mod = {};
+  function setter(elem) {
+    delete Array.prototype[0]; // Delete the setter
+    this.push(elem); // Push the element for real
+    mod = elem; // Export the gathered module
+  }
+  Array.prototype.__defineSetter__(0, setter);
+  export const _foo = await Promise.resolve(5);
+`);
+
+const m2 = parseModule(`
+  import {mod} from 'm1';
+  assertEq(mod.status, undefined);
+`);
+
+registerModule('m1', m1);
+moduleLink(m2);
+moduleEvaluate(m2);
+drainJobQueue();