add gc stress test

include/picconf.h

@@ -19,6 +19,7 @@
 /* enable all debug flags */
 #define DEBUG 1
 
+#define GC_STRESS 1
 
 #if DEBUG
 # define GC_DEBUG 1

src/gc.c

@@ -398,6 +398,10 @@ pic_obj_alloc(pic_state *pic, size_t size, enum pic_tt tt)
 {
   struct pic_object *obj;
 
+#if GC_STRESS
+  pic_gc_run(pic);
+#endif
+
   obj = (struct pic_object *)gc_alloc(pic, size);
   if (obj == NULL) {
     pic_gc_run(pic);