Remove support for legacy const, part 1

test/mjsunit/regress/regress-3138.js

Index: test/mjsunit/regress/regress-3138.js
diff --git a/test/mjsunit/regress/regress-3138.js b/test/mjsunit/regress/regress-3138.js
index 6f0430c85591ddaf721d7f197714afbd4b5e50ba..4f607ed6d23f019cf4e2f46fec34b7039d10a7cc 100644
--- a/test/mjsunit/regress/regress-3138.js
+++ b/test/mjsunit/regress/regress-3138.js
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --legacy-const
-
 (function f(){
    assertEquals("function", typeof f);
 })();
@@ -30,13 +28,3 @@ assertEquals("undefined", typeof f);
   assertEquals("undefined", typeof a);
   assertEquals(2, o.a);
 })();
-
-// const initialization is not intercepted by with scope.
-(function() {
-  var o = { a: 1 };
-  with (o) {
-    const a = 2;
-  }
-  assertEquals(2, a);
-  assertEquals(1, o.a);
-})();