Reland of [ignition/turbo] Perform liveness analysis on the bytecodes

test/debugger/debug/regress/regress-5071.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.
+//
+// Flags: --noanalyze-environment-liveness
 
 
 var Debug = debug.Debug;
 var exception = null;
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   try {
     assertEquals(2, exec_state.frameCount());
     assertEquals("a", exec_state.frame(0).localName(0));
     assertEquals(1, exec_state.frame(0).localValue(0).value());
     assertEquals(1, exec_state.frame(0).localCount());
   } catch (e) {
     exception = e;
   }
 }
 
 function f() {
   var a = 1;
   {
     let b = 2;
     debugger;
   }
 }
 
 Debug.setListener(listener);
 f();
 Debug.setListener(null);
 assertNull(exception);