compile.c: support for TS_FUNCPTR

* compile.c (iseq_set_sequence): support for TS_FUNCPTR.

* compile.c (insn_data_to_s_detail): ditto.

* compile.c (iseq_build_from_ary_body): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48849 b2dd03c8-39d4-4d8f-98ff-823fe69b080e