test: use checkIfCollectableByCounting in SourceTextModule leak test

...which may be more reliable than than checkIfCollectable().

test/es-module/test-vm-source-text-module-leak.js

@@ -1,21 +1,24 @@
-// Flags: --experimental-vm-modules --max-old-space-size=16 --trace-gc
+// Flags: --expose-internals --experimental-vm-modules --max-old-space-size=16 --trace-gc
 'use strict';
 
 // This tests that vm.SourceTextModule() does not leak.
 // See: https://github.com/nodejs/node/issues/33439
-require('../common');
-const { checkIfCollectable } = require('../common/gc');
+const common = require('../common');
+const { checkIfCollectableByCounting } = require('../common/gc');
 const vm = require('vm');
 
-async function createSourceTextModule() {
-  // Try to reach the maximum old space size.
-  const m = new vm.SourceTextModule(`
-    const bar = new Array(512).fill("----");
-    export { bar };
-  `);
-  await m.link(() => {});
-  await m.evaluate();
-  return m;
-}
+const outer = 32;
+const inner = 128;
 
-checkIfCollectable(createSourceTextModule, 4096, 1024);
+checkIfCollectableByCounting(async (i) => {
+  for (let j = 0; j < inner; j++) {
+    // Try to reach the maximum old space size.
+    const m = new vm.SourceTextModule(`
+      const bar = new Array(512).fill("----");
+      export { bar };
+    `);
+    await m.link(() => {});
+    await m.evaluate();
+  }
+  return inner;
+}, vm.SourceTextModule, outer).then(common.mustCall());