Bug 1680241 - Disable GC zeal in script-source-extent.js test r=tcampbell

Differential Revision: https://phabricator.services.mozilla.com/D98470

js/src/jit-test/tests/parser/script-source-extent.js

@@ -13,6 +13,9 @@
 let dbg = new Debugger();
 let debuggeeCompartment = newGlobal({newCompartment: true});
 
+// Some static class field initializer lambdas may be thrown away by GC.
+gczeal(0);
+
 function getScriptSourceExtent(source) {
     // NOTE: We will _evaluate_ the source below which may introduce dynamic
     //       scripts which are also reported. This is intended so that we may test