[proxies] Make Object.{freeze,seal} behave correctly for proxies.

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
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@@ skipping 73 matching lines @@
   'harmony/module-recompile': [SKIP],
   'harmony/module-resolution': [SKIP],
   'harmony/regress/regress-343928': [SKIP],
 
   # Proxy tests rely on non ES6 version of Proxies
   # TODO(neis,cbruni): figure out which Proxy tests can be reused
   'es6/classes-proxy' : [SKIP],
   'es6/regress/regress-cr493566': [SKIP],
   'for-in-opt': [SKIP],
   'harmony/proxies-example-membrane': [SKIP],
-  'harmony/proxies-hash': [SKIP],
   'harmony/proxies-json': [SKIP],
   'harmony/proxies': [SKIP],
   'harmony/proxies-symbols': [SKIP],
   'harmony/proxies-with': [SKIP],
   'harmony/proxies-with-unscopables': [SKIP],
   'harmony/regress/regress-2219': [SKIP],
   'harmony/regress/regress-2225': [SKIP],
   'harmony/regress/regress-405844': [SKIP],
   'harmony/regress/regress-crbug-461520': [SKIP],
   'harmony/regress/regress-lookup-transition': [SKIP],
@@ skipping 965 matching lines @@
   'regress/regress-crbug-347903': [SKIP],
   'regress/regress-crbug-505007-1': [SKIP],
   'regress/regress-crbug-505007-2': [SKIP],
   'regress/short-circuit': [SKIP],
   'stack-traces-overflow': [SKIP],
   'unicodelctest': [SKIP],
   'unicodelctest-no-optimization': [SKIP],
 }],  # ignition == True and (arch == arm or arch == arm64)
 
 ]