Use RBIMPL_ASSERT_OR_ASSUME instead of ASSUME for better errors when it does not hold

Author: eregon

gc/default/default.c

@@ -6094,8 +6094,8 @@ rb_gc_impl_writebarrier(void *objspace_ptr, VALUE a, VALUE b)
     if (SPECIAL_CONST_P(a)) rb_bug("rb_gc_writebarrier: a is special const: %"PRIxVALUE, a);
     if (SPECIAL_CONST_P(b)) rb_bug("rb_gc_writebarrier: b is special const: %"PRIxVALUE, b);
 #else
-    ASSUME(!SPECIAL_CONST_P(a));
-    ASSUME(!SPECIAL_CONST_P(b));
+    RBIMPL_ASSERT_OR_ASSUME(!SPECIAL_CONST_P(a));
+    RBIMPL_ASSERT_OR_ASSUME(!SPECIAL_CONST_P(b));
 #endif
 
     GC_ASSERT(!during_gc);