iseq_load.c: rb_path2class

* ext/-test-/iseq_load/iseq_load.c (Init_iseq_load): use
  rb_path2class.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48707 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
prelude.c.tmpl: require_relative

* template/prelude.c.tmpl (Prelude#translate): support for
  require_relative and comments followed by #.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48708 b2dd03c8-39d4-4d8f-98ff-823fe69b080e