* hash.c (rb_hash_shift): should consider iter_lev too.
	* hash.c (delete_if_i): use rb_hash_delete_key() so that the block
	  isn't called twice.  [ruby-core:11556]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@13224 b2dd03c8-39d4-4d8f-98ff-823fe69b080e