Bug 1240521 - Fix the test case to ensure that oomAfterAllocation is defined. r=red

js/src/jit-test/tests/ion/bug1240521.js

@@ -1,4 +1,8 @@
 // |jit-test| allow-oom
+
+if (!('oomAfterAllocations' in this))
+    quit();
+
 var egc = 138;
 function SwitchTest(value) {
     switch (value) {