Bug 1433014 - Cancel off thread job if we fail to append it to job list r=luke

js/src/jit-test/tests/parser/bug-1433014.js

@@ -0,0 +1,8 @@
+if (helperThreadCount() === 0)
+    quit();
+
+options('strict');
+evaluate(`
+    oomTest(() => {
+        offThreadCompileScript("");
+    });`);

js/src/shell/js.cpp

@@ -271,6 +271,7 @@ NewOffThreadJob(JSContext* cx, ScriptKind kind, OffThreadJob::Source&& source)
         return nullptr;
 
     if (!sc->offThreadJobs.append(job.get())) {
+        job->cancel();
         JS_ReportErrorASCII(cx, "OOM adding off-thread job");
         return nullptr;
     }