[turbofan] Remove deprecated --turbo-from-bytecode flag.

test/mjsunit/regress/regress-632289.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: --ignition --turbo-from-bytecode --always-opt --allow-natives-syntax
+// Flags: --ignition --always-opt --allow-natives-syntax
 
 try {
 } catch(e) {; }
 (function __f_12() {
 })();
 (function __f_6() {
   function __f_3() {
   }
   function __f_4() {
     try {
     } catch (e) {
     }
   }
  __f_4();
   %OptimizeFunctionOnNextCall(__f_4);
  __f_4();
 })();