[turbofan] Remove --turbo-asm-deoptimization flag.

test/mjsunit/compiler/regress-uint8-deopt.js

-// 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: --turbo-asm --turbo-asm-deoptimization --allow-natives-syntax
-
-function Module(heap) {
-  "use asm";
-  var a = new Uint8Array(heap);
-  function f() {
-    var x = a[0] | 0;
-    %DeoptimizeFunction(f);
-    return x;
-  }
-  return f;
-}
-assertEquals(0, Module(new ArrayBuffer(1))());