test: add test case that crashes when throwing an exception with vm.Script

It failed with `FATAL ERROR: v8::ToLocalChecked Empty MaybeLocal`.

test/parallel/test-vm-script-throw-in-tostring.js

@@ -0,0 +1,14 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+const vm = require('vm');
+
+assert.throws(() => {
+  new vm.Script({
+    toString() {
+      throw new Error();
+    }
+  });
+}, Error);