fixup! testFinalizerException to gc until it throws

test/js-native-api/test_exception/testFinalizerException.js

@@ -9,14 +9,24 @@ if (process.argv[2] === 'child') {
   } catch (anException) {
     anException.binding.createExternal();
   }
-  const interval = setInterval(() => {
-    clearInterval(interval);
-  }, 100);
+
+  // Collect garbage 10 times. At least one of those should throw the exception
+  // and cause the whole process to bail with it, its text printed to stderr and
+  // asserted by the parent process to match expectations.
+  let gcCount = 10;
+  (function gcLoop() {
+    global.gc();
+    if (--gcCount > 0) {
+      setImmediate(() => gcLoop());
+    }
+  })();
   return;
 }
 
 const assert = require('assert');
 const { spawnSync } = require('child_process');
-const child = spawnSync(process.execPath, [ __filename, 'child' ]);
+const child = spawnSync(process.execPath, [
+  '--expose-gc', __filename, 'child'
+]);
 assert.strictEqual(child.signal, null);
 assert.match(child.stderr.toString(), /Error during Finalize/m);