Refactor VM root modules

This `st_table` is used to both mark and pin classes
defined from the C API. But `vm->mark_object_ary` already
does both much more efficiently.

Currently a Ruby process starts with 252 rooted classes,
which uses `7224B` in an `st_table` or `2016B` in an `RArray`.

So a baseline of 5kB saved, but since `mark_object_ary` is
preallocated with `1024` slots but only use `405` of them,
it's a net `7kB` save.

`vm->mark_object_ary` is also being refactored.

Prior to this changes, `mark_object_ary` was a regular `RArray`, but
since this allows for references to be moved, it was marked a second
time from `rb_vm_mark()` to pin these objects.

This has the detrimental effect of marking these references on every
minors even though it's a mostly append only list.

But using a custom TypedData we can save from having to mark
all the references on minor GC runs.

Addtionally, immediate values are now ignored and not appended
to `vm->mark_object_ary` as it's just wasted space.

mini_builtin.c

@@ -51,7 +51,7 @@ builtin_iseq_load(const char *feature_name, const struct rb_builtin_function *ta
 
 #ifndef INCLUDED_BY_BUILTIN_C
     st_insert(loaded_builtin_table, (st_data_t)feature_name, (st_data_t)iseq);
-    rb_gc_register_mark_object((VALUE)iseq);
+    rb_vm_register_global_object((VALUE)iseq);
 #endif
 
     return iseq;