[proxy] fixing harmony/proxy.js tests and improving error messages + some drive-by fixes

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
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@@ skipping 70 matching lines @@
 
   # Modules are busted
   'harmony/module-linking': [SKIP],
   '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/regress/regress-cr493566': [SKIP],
-  'for-in-opt': [SKIP],
   'harmony/proxies-example-membrane': [SKIP],
   'harmony/proxies-json': [SKIP],
-  'harmony/proxies': [SKIP],
   'harmony/proxies-symbols': [SKIP],
   'harmony/proxies-with': [SKIP],

[neis, 2015/12/10 15:13:50]

Can't proxies-with be enabled?

[Camillo Bruni, 2015/12/10 20:22:13]

yes indeed.

   '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],
-  'regress/regress-crbug-493568': [SKIP],
   'strong/load-proxy': [SKIP],
 
   # Issue 3660: Replacing activated TurboFan frames by unoptimized code does
   # not work, but we expect it to not crash.
   'debug-step-turbofan': [PASS, FAIL],
 
   # TODO(mstarzinger): Optimizing top-level code revealed some issues. Fix!
   'bitops-info': [PASS, NO_VARIANTS],  # fails on ARM hardware.
   'md5': [PASS, NO_VARIANTS],  # fails on ARM hardware.
   'debug-break-inline': [PASS, NO_VARIANTS],  # very flaky.
@@ skipping 954 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)
 
 ]