[parser] Skipping inner funcs: Add a simple mjsunit test.

Unfortunately, this test cannot test that a function was really skipped (i.e.,
not parsed).

BUG=v8:5516

Change-Id: I8db5027d2216a95cc012ceae8e17554095cc1d4f
Reviewed-on: https://chromium-review.googlesource.com/457037Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44615}

test/mjsunit/skipping-inner-functions.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --preparser-scope-analysis
+
+(function TestBasicSkipping() {
+  var result = 0;
+
+  function lazy(ctxt_alloc_param) {
+    var ctxt_alloc_var = 10;
+    function skip_me() {
+      result = ctxt_alloc_param + ctxt_alloc_var;
+    }
+    return skip_me;
+  }
+  // Test that parameters and variables of the outer function get context
+  // allocated even if we skip the inner function.
+  lazy(9)();
+  assertEquals(19, result);
+})();
+
+(function TestSkippingFunctionWithEval() {
+  var result = 0;
+
+  function lazy(ctxt_alloc_param) {
+    var ctxt_alloc_var = 10;
+    function skip_me() {
+      eval('result = ctxt_alloc_param + ctxt_alloc_var');
+    }
+    return skip_me;
+  }
+  // Test that parameters and variables of the outer function get context
+  // allocated even if we skip the inner function.
+  lazy(9)();
+  assertEquals(19, result);
+})();