Alternative patch for gms

gistfile1.diff

diff --git a/src/gc/gc_gms.c b/src/gc/gc_gms.c
index 88b9956..48d2e28 100644
--- a/src/gc/gc_gms.c
+++ b/src/gc/gc_gms.c
@@ -1511,6 +1511,8 @@ establish if *ptr is.owned
 
 */
 
+#define INVALID_PTR_MASK (PTR_SIZE - 1)
+
 static int
 gc_gms_is_pmc_ptr(PARROT_INTERP, ARGIN_NULLOK(void *ptr))
 {
@@ -1521,7 +1523,7 @@ gc_gms_is_pmc_ptr(PARROT_INTERP, ARGIN_NULLOK(void *ptr))
     size_t            i;
 
     /* Not aligned pointers aren't pointers */
-    if (!obj || !item || ((int)obj & 3) || ((int)item & 3))
+    if (!obj || !item || ((int)obj & INVALID_PTR_MASK) || ((int)item & INVALID_PTR_MASK))
         return 0;
 
     if (!Parrot_gc_pool_is_maybe_owned(interp, self->pmc_allocator, item))