<https://webkit.org/b/135085> Ensure that make_names.pl generates the same result when run multiple times.

Perl 5.18 introduced hash randomization. This results in the iteration order of hashes being different
from one run to the next. To ensure identical output we can iterate over the hash keys in sorted order.

Reviewed by Alexey Proskuryakov.

* bindings/scripts/StaticString.pm:
(GenerateStrings):
(GenerateStringAsserts):
* dom/make_names.pl:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@171264 268f45cc-cd09-0410-ab3c-d52691b4dbfc