vm_insnhelper.c: preserve encoding
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48047 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm_insnhelper.c: preserve encoding
warning message.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48047 b2dd03c8-39d4-4d8f-98ff-823fe69b080e