* test/ruby/test_io_m17n.rb: Add test for coderange clearing in
  IO#read with buffer. See jruby/jruby#2316.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48847 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-12-16

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48848 b2dd03c8-39d4-4d8f-98ff-823fe69b080e