Bugfix: Make sure not to overwrite the empty optimized code map root.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 1032 matching lines @@
   'with-readonly': [SKIP],
   'regress/typed-array-lifetime': [SKIP],
   'regress/regress-crbug-522895': [SKIP],
   'regress/regress-crbug-455644': [SKIP],
   'regress/regress-crbug-109362': [SKIP],
   'regress/regress-crbug-429159': [SKIP],
   'regress/regress-crbug-517592': [SKIP],
   'regress/regress-crbug-405517': [SKIP],
   'regress/regress-799761': [SKIP],
   'regress/regress-503565': [SKIP],
+  'regress/regress-568765': [SKIP],
   'regress/regress-3138': [SKIP],
   'regress/regress-220': [SKIP],
   'regress/regress-1170187': [SKIP],
   'regress/regress-1030466': [SKIP],
   'regress/regress-1853': [SKIP],
   'with-value': [SKIP],
   'with-function-expression': [SKIP],
   'switch': [SKIP],
   'receiver-in-with-calls': [SKIP],
   'local-load-from-eval': [SKIP],
@@ skipping 30 matching lines @@
 
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
   'strong/implicit-conversions': [SKIP],
   'strong/load-element-mutate-backing-store': [SKIP],
 }],  # 'gcov_coverage'
 
 ]