Bug 1588955. Add test case of large frameset.

Differential Revision: https://phabricator.services.mozilla.com/D67338

--HG--
extra : moz-landing-system : lando

layout/generic/crashtests/crashtests.list

@@ -755,3 +755,4 @@ load 1608851.html
 load 1613210.html
 load 1618312.html
 load 1618564.html
+load very-large-frameset.html

layout/generic/crashtests/very-large-frameset.html

@@ -0,0 +1,9 @@
+<style>
+* { scale: 64 }
+</style>
+<script>
+window.onload = () => {
+  a.appendChild(document.createElement("frameset"))
+}
+</script>
+<ol id="a">