Added macro LUAI_STRICT_ADDRESS

By default, the code assumes it is safe to use a dealocated pointer
as long as the code does not access it.

ltests.h

@@ -44,6 +44,10 @@
 #define LUA_RAND32
 
 
+/* test stack reallocation with strict address use */
+#define LUAI_STRICT_ADDRESS	1
+
+
 /* memory-allocator control variables */
 typedef struct Memcontrol {
   int failnext;