Change name of free_whitelisted_vm_weak_references_from_sweep_thread

Since MMTK might also use this, called it something more generic.
It's now `rb_gc_obj_free_concurrency_safe_vm_weak_references`.

Author: luke-gruber

gc.c

@@ -2420,9 +2420,8 @@ obj_free_object_id(VALUE obj, bool in_user_gc_thread)
 }
 
 bool
-rb_gc_obj_free_whitelisted_vm_weak_references_in_sweep_thread(VALUE obj)
+rb_gc_obj_free_concurrency_safe_vm_weak_references(VALUE obj)
 {
-    VM_ASSERT(pthread_self() == GET_VM()->gc.sweep_thread);
     bool result = obj_free_object_id(obj, false);
     if (RB_UNLIKELY(rb_obj_gen_fields_p(obj))) {
         bool freed_generic = rb_free_generic_ivar(obj);

gc/default/default.c

@@ -4325,8 +4325,6 @@ debug_free_check(rb_objspace_t *objspace, VALUE vp)
 #define debug_free_check(...) (void)0
 #endif
 
-bool rb_gc_obj_free_whitelisted_vm_weak_references_in_sweep_thread(VALUE obj);
-
 static inline void
 gc_pre_sweep_plane(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *page, uintptr_t p, bits_t bitset, short slot_size)
 {
@@ -4442,7 +4440,7 @@ gc_pre_sweep_plane(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *p
                 break;
               free: {
                   debug_free_check(objspace, vp);
-                  if (RB_LIKELY(rb_gc_obj_free_whitelisted_vm_weak_references_in_sweep_thread(vp))) {
+                  if (RB_LIKELY(rb_gc_obj_free_concurrency_safe_vm_weak_references(vp))) {
                       bool can_put_back_on_freelist = rb_gc_obj_free(objspace, vp);
                       if (can_put_back_on_freelist) {
                           heap_page_add_freeobj(objspace, page, vp, true);

gc/gc.h

@@ -82,6 +82,7 @@ MODULAR_GC_FN void rb_gc_run_obj_finalizer(VALUE objid, long count, VALUE (*call
 MODULAR_GC_FN void rb_gc_set_pending_interrupt(void);
 MODULAR_GC_FN void rb_gc_unset_pending_interrupt(void);
 MODULAR_GC_FN bool rb_gc_obj_free_vm_weak_references(VALUE obj);
+MODULAR_GC_FN bool rb_gc_obj_free_concurrency_safe_vm_weak_references(VALUE obj);
 MODULAR_GC_FN bool rb_gc_obj_free(void *objspace, VALUE obj);
 MODULAR_GC_FN void rb_gc_save_machine_context(void);
 MODULAR_GC_FN void rb_gc_mark_roots(void *objspace, const char **categoryp);