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, 3 deletions

diff --git a/eval.c b/eval.c
index 52f3cc4e9f..237d9acaa7 100644
--- a/eval.c
+++ b/eval.c
@@ -1551,9 +1551,6 @@ rb_mod_refine(VALUE module, VALUE klass)
     }
 
     ensure_class_or_module(klass);
-    if (RB_TYPE_P(klass, T_MODULE)) {
-        rb_ensure_origin(klass);
-    }
     CONST_ID(id_refinements, "__refinements__");
     refinements = rb_attr_get(module, id_refinements);
     if (NIL_P(refinements)) {