undef `rb_vm_lookup_overloaded_cme()`

Some callable method entries (cme) can be a key of `overloaded_cme_table`
and the keys should be pinned because the table is numtable (VALUE is a key).
Before the patch GC checks the cme is in `overloaded_cme_table` by looking up
the table, but it needs VM locking.

It works well in normal GC marking because it is protected by the VM lock,
but it doesn't work on `rb_objspace_reachable_objects_from` because it doesn't
use VM lock.

Now, the number of target cmes are small enough, I decide to pin down
all possible cmes instead of using looking up the table.

1 files changed, 2 insertions, 1 deletions

diff --git a/vm_method.c b/vm_method.c
index b8197e14ca..38d03fbe2b 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -979,12 +979,13 @@ lookup_overloaded_cme(const rb_callable_method_entry_t *cme)
     return monly_cme;
 }
 
-// used by gc.c
+#if VM_CHECK_MODE > 0
 MJIT_FUNC_EXPORTED const rb_callable_method_entry_t *
 rb_vm_lookup_overloaded_cme(const rb_callable_method_entry_t *cme)
 {
     return lookup_overloaded_cme(cme);
 }
+#endif
 
 static void
 delete_overloaded_cme(const rb_callable_method_entry_t *cme)