Merge pull request #1168 from rwaldron/proxy-own-keys-duplicates-throws

...oxy/ownKeys/call-parameters-object-getownpropertynames.js

...y/ownKeys/call-parameters-object-getownpropertysymbols.js

test/built-ins/Proxy/ownKeys/call-parameters-object-keys.js

...nsible-return-trap-result-absent-not-configurable-keys.js

.../built-ins/Proxy/ownKeys/extensible-return-trap-result.js

...t-ins/Proxy/ownKeys/not-extensible-missing-keys-throws.js

...built-ins/Proxy/ownKeys/not-extensible-new-keys-throws.js

test/built-ins/Proxy/ownKeys/not-extensible-return-keys.js

test/built-ins/Proxy/ownKeys/null-handler.js

...ilt-ins/Proxy/ownKeys/return-all-non-configurable-keys.js

...uilt-ins/Proxy/ownKeys/return-duplicate-entries-throws.js

...s/Proxy/ownKeys/return-duplicate-symbol-entries-throws.js

test/built-ins/Proxy/ownKeys/return-is-abrupt.js

...-ins/Proxy/ownKeys/return-not-list-object-throws-realm.js

.../built-ins/Proxy/ownKeys/return-not-list-object-throws.js

test/built-ins/Proxy/ownKeys/trap-is-not-callable-realm.js

test/built-ins/Proxy/ownKeys/trap-is-not-callable.js

test/built-ins/Proxy/ownKeys/trap-is-undefined.js