[mjsunit] Remove unsupported flag --turbo-deoptimization from tests.

test/mjsunit/regress/regress-crbug-489293.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: --allow-natives-syntax --turbo-filter=f --turbo-deoptimization
+// Flags: --allow-natives-syntax --turbo-filter=f
 // Flags: --noanalyze-environment-liveness
 
 function f() {
   var x = 0;
   for (var y = 0; y < 0; ++y) {
     x = (x + y) | 0;
   }
   return unbound;
 }
 %OptimizeFunctionOnNextCall(f);
 assertThrows(f, ReferenceError);