variable.c: use indices for generic ivars

This reduces memory overhead of ivars for common types such as
T_DATA the same way T_OBJECT does it.

For 9992 accepted clients on an OpenSSL server, this reduces
memory from 77160K to 69248K with the script in
https://bugs.ruby-lang.org/issues/11170

* variable.c (static int special_generic_ivar): move
  (rb_generic_ivar_table): rewrite for compatibility
  (gen_ivtbl_bytes): new function
  (generic_ivar_get): update to use ivar index
  (generic_ivar_update): ditto
  (generic_ivar_set): ditto
  (generic_ivar_defined): ditto
  (generic_ivar_remove): ditto
  (rb_mark_generic_ivar): ditto
  (givar_i): ditto
  (rb_free_generic_ivar): ditto
  (rb_mark_generic_ivar_tbl): ditto
  (rb_generic_ivar_memsize): ditto
  (rb_copy_generic_ivar): ditto
  (rb_ivar_set): ditto
  (rb_ivar_foreach): ditto
  (rb_ivar_count): ditto
  (givar_mark_i): remove
  (gen_ivtbl_mark): new function
  (gen_ivar_each): ditto
  (iv_index_tbl_extend): update for struct ivar_update
  (iv_index_tbl_newsize): ditto
  [ruby-core:69323] [Feature #11170]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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