[Interpreter] Handles legacy constants in strict mode.

test/mjsunit/ignition/regress-599068-func-bindings.js

 // Copyright 2016 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.
-//
-//
 
-var f = (a, ...x = 10) => x;
-f(1, 2, 3, 4, 5);
+(function encodeURI() {
+    function Func() {
+      'use strict';
+      encodeURI += 'function';

[Michael Starzinger, 2016/04/01 13:29:13]

Maybe I am missing something here, but this should throw a TypeError IIRC. And
it does so in full-codegen. Can we adapt the test case to actually call the
"Func" function? I was thinking about a test case like the following ...

(function f() {
  function assignSloppy() {
    f = 0;
  }
  assertDoesNotThrow(assignSloppy);
  function assignStrict() {
    'use strict';
    f = 0;
  }
  assertThrows(assignStrict);
})();

+    }
+})();