These methods are designed to work on generic objects too, and if 'length'
is a getter that throws an exception, ensure this is correctly thrown
(even if other exceptions would be thrown, too).

Reviewed by Sam Weinig

Source/JavaScriptCore: 

Make the length check the first thing we do.
This change shows a progression on SunSpider on my machine, but this is likely bogus.

* runtime/ArrayPrototype.cpp:
(JSC::arrayProtoFuncToString):
(JSC::arrayProtoFuncToLocaleString):
(JSC::arrayProtoFuncJoin):
(JSC::arrayProtoFuncPop):
(JSC::arrayProtoFuncPush):
(JSC::arrayProtoFuncReverse):
(JSC::arrayProtoFuncShift):
(JSC::arrayProtoFuncSlice):
(JSC::arrayProtoFuncSort):
(JSC::arrayProtoFuncSplice):
(JSC::arrayProtoFuncUnShift):
(JSC::arrayProtoFuncFilter):
(JSC::arrayProtoFuncMap):
(JSC::arrayProtoFuncEvery):
(JSC::arrayProtoFuncForEach):
(JSC::arrayProtoFuncSome):
(JSC::arrayProtoFuncReduce):
(JSC::arrayProtoFuncReduceRight):
(JSC::arrayProtoFuncIndexOf):
(JSC::arrayProtoFuncLastIndexOf):

LayoutTests: 

Added test cases.

* fast/js/array-proto-func-length-getter-except-expected.txt: Added.
* fast/js/array-proto-func-length-getter-except.html: Added.
* fast/js/script-tests/array-proto-func-length-getter-except.js: Added.
(lengthGetter):
(test):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@80621 268f45cc-cd09-0410-ab3c-d52691b4dbfc