[turbofan] Re-enable mozilla test that no longer fails.

test/mozilla/mozilla.status

 # Copyright 2011 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 52 matching lines @@
   'ecma_3/Statements/regress-74474-002': [PASS, NO_VARIANTS],
   'ecma_3/Statements/regress-74474-003': [PASS, NO_VARIANTS],
   'js1_5/Regress/regress-111557': [PASS, NO_VARIANTS],
   'js1_5/Regress/regress-155081': [PASS, NO_VARIANTS],
   'js1_5/Regress/regress-155081-2': [PASS, NO_VARIANTS],
   'js1_5/Regress/regress-451322': [PASS, NO_VARIANTS],
 
   # TODO(turbofan): Large switch statements crash.
   'js1_5/Regress/regress-398085-01': [PASS, NO_VARIANTS],
 
-  # TODO(mstarzinger): Investigate failure with lookup slot declaration.
-  'js1_5/Regress/regress-343713': [PASS, NO_VARIANTS],
-
   ############################ INVALID TESTS #############################
 
   # Function length properties are configurable in ES6
   'ecma/Array/15.4.4.3-1': [FAIL],
   'ecma/Array/15.4.4.4-1': [FAIL],
   'ecma/Array/15.4.4.4-2': [FAIL],
   'ecma/String/15.5.4.10-1': [FAIL],
   'ecma/String/15.5.4.11-1': [FAIL],
   'ecma/String/15.5.4.7-2': [FAIL],
   'ecma/String/15.5.4.8-1': [FAIL],
@@ skipping 874 matching lines @@
   'ecma_3/RegExp/regress-307456': [SKIP],
   'js1_5/Regress/regress-303213': [SKIP],
   'js1_5/extensions/regress-330569': [SKIP],
   'js1_5/extensions/regress-351448': [SKIP],
   'js1_5/extensions/regress-336410-1': [SKIP],
 
   #BUG(3152): Avoid C stack overflow.
   'js1_5/extensions/regress-355497': [FAIL_OK, 'Flags: --sim-stack-size=512'],
 }],  # 'arch == arm64 and simulator_run == True'
 ]