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

test/mjsunit/regress/regress-crbug-480819.js

Index: test/mjsunit/regress/regress-crbug-480819.js
diff --git a/test/mjsunit/regress/regress-crbug-480819.js b/test/mjsunit/regress/regress-crbug-480819.js
index 8d3b7eed60ea20d880cf68def679cd859263ea99..086f6c84c23a821deabbcc64e27de55779095fe8 100644
--- a/test/mjsunit/regress/regress-crbug-480819.js
+++ b/test/mjsunit/regress/regress-crbug-480819.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --turbo-filter=* --always-opt --turbo-deoptimization --noanalyze-environment-liveness
+// Flags: --turbo-filter=* --always-opt --noanalyze-environment-liveness
 
 (function() {
   "use strict";