Remove support for legacy const, part 1

test/mjsunit/regress/regress-handle-illegal-redeclaration.js

Index: test/mjsunit/regress/regress-handle-illegal-redeclaration.js
diff --git a/test/mjsunit/regress/regress-handle-illegal-redeclaration.js b/test/mjsunit/regress/regress-handle-illegal-redeclaration.js
deleted file mode 100644
index fc4ba900dbb4a51b497c41fcee77afca942a11ea..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-handle-illegal-redeclaration.js
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2014 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: --always-opt --legacy-const
-
-var x = 0;
-
-function f() {
-  const c;
-  var c;
-  return 0 + x;
-}
-
-assertThrows(f);