* array.c (rb_ary_bsearch): Return enumerator if no block [#7725]

* range.c (range_bsearch): ditto

* test/ruby/test_array.rb: Test for above

* test/ruby/test_range.rb: ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38984 b2dd03c8-39d4-4d8f-98ff-823fe69b080e