Remove support for legacy const, part 1

test/mjsunit/regress/regress-debugger-redirect.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.
-
-// Flags: --expose-debug-as debug --legacy-const
-
-function f(x) {
-  // This function compiles into code that only throws a redeclaration
-  // error. It contains no stack check and has no function body.
-  const x = 0;
-  return x;
-}
-
-function g() {
-  f(0);
-}
-
-var exception = null;
-var called = false;
-var Debug = debug.Debug;
-Debug.setBreakOnException();
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Exception) return;
-  try {
-    called = true;
-    Debug.setBreakPoint(f, 1);
-  } catch (e) {
-    exception = e;
-  }
-}
-
-Debug.setListener(listener);
-
-assertThrows(g);
-assertNull(exception);
-assertTrue(called);