Bug 1814899: Add testcase r=jandem

Depends on D169274

Differential Revision: https://phabricator.services.mozilla.com/D169275

UltraBlame original commit: 0e73c493db8f0194bb693259468516934fa46c20

Author: marco-c

js/src/jit-test/tests/ion/bug1814899.js

@@ -0,0 +1,22 @@
+function bar(x) {
+  with ({}) {}
+  switch (x) {
+  case 1:
+    foo(2);
+    break;
+  case 2:
+    gczeal(14, 1);
+    break;
+  }
+  return "a sufficiently long string";
+}
+
+function foo(x) {
+  for (var s in bar(x)) { gczeal(0); }
+}
+
+with ({}) {}
+for (var i = 0; i < 100; i++) {
+  foo(0);
+}
+foo(1);