Lazily insert origins on prepend to save memory

98286e9850936e27e8ae5e4f20858cc9c13d2dde made it so that
`Module#include` allocates an origin iclass on each use. Since `include`
is widely used, the extra allocation can contribute significantly to
memory usage.

Instead of always allocating in anticipation of prepend, this change
takes a different approach. The new setup inserts a origin iclass into
the super chains of all the children of the module when prepend happens
for the first time.

rb_ensure_origin is made static again since now that adding an origin
now means walking over all usages, we want to limit the number of places
where we do it.

1 files changed, 0 insertions, 1 deletions

diff --git a/internal/class.h b/internal/class.h
index eb4e7883f6..40938255af 100644
--- a/internal/class.h
+++ b/internal/class.h
@@ -119,7 +119,6 @@ VALUE rb_singleton_class_clone_and_attach(VALUE obj, VALUE attach);
 VALUE rb_singleton_class_get(VALUE obj);
 int rb_class_has_methods(VALUE c);
 void rb_undef_methods_from(VALUE klass, VALUE super);
-void rb_ensure_origin(VALUE klass);
 
 static inline void RCLASS_SET_ORIGIN(VALUE klass, VALUE origin);
 static inline void RICLASS_SET_ORIGIN_SHARED_MTBL(VALUE iclass);