merge revision(s) 61591: [Backport #14312]
iseq.c (rb_iseq_new_with_opt): handle the case where node is imemo_func
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@62472 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 61591: [Backport #14312]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@62472 b2dd03c8-39d4-4d8f-98ff-823fe69b080e