compile.c: fix positions encode
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63103 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
compile.c: fix positions encode
positions is set in ibf_load_code(). [Bug #14660]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63103 b2dd03c8-39d4-4d8f-98ff-823fe69b080e