Move sloppy block function hoisting logic from Parser to Scope.

test/mjsunit/es6/block-sloppy-function.js

 // Copyright 2015 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.
 
 // Test Annex B 3.3 semantics for functions declared in blocks in sloppy mode.
 // http://www.ecma-international.org/ecma-262/6.0/#sec-block-level-function-declarations-web-legacy-compatibility-semantics
 
 (function overridingLocalFunction() {
   var x = [];
   assertEquals('function', typeof f);
@@ skipping 49 matching lines @@
     let y = 3;
     function f() {
       y = 2;
     }
     f();
     assertEquals(2, y);
   }
   assertEquals(1, f);
 })();
 
+(function shadowingLetDoesntBindGenerator() {
+  let f = function *f() {
+    while(true) {
+      yield 1;
+    }
+  };
+  assertEquals(1, f().next().value);
+  {
+    function *f() {
+      while(true) {
+        yield 2;
+      }
+    }
+    assertEquals(2, f().next().value);
+  }
+  assertEquals(1, f().next().value);
+})();
+
 (function shadowingClassDoesntBind() {
   class f { }
   assertEquals('class f { }', f.toString());
   {
     let y = 3;
     function f() {
       y = 2;
     }
     f();
     assertEquals(2, y);
@@ skipping 567 matching lines @@
   try {
     eval('{ function hoistWhenFrozen() {} }');
   } catch (e) {
     throws = true;
   }
   assertFalse(this.hasOwnProperty("hoistWhenFrozen"));
   assertThrows(() => hoistWhenFrozen, ReferenceError);
   // Should be assertFalse BUG(v8:4452)
   assertTrue(throws);
 }