iseq.c: consistent rb_bug messages
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63275 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
iseq.c: consistent rb_bug messages
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63275 b2dd03c8-39d4-4d8f-98ff-823fe69b080e