given. backported from MatzRuby. [ruby-dev:31609]
* eval_jump.ci (rb_catch): call #catch without arguments if tag
string is NULL.
* eval_jump.ci (rb_f_throw): allow throwing non-symbol object.
* eval.c (rb_catch_obj): new function to wait throw with arbitrary
object.
* eval.c (rb_throw_obj): new function to throw arbitrary object.
* variable.c (check_autoload_table): prevent multiple calls from
RSTRING_PTR().
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13331 b2dd03c8-39d4-4d8f-98ff-823fe69b080e