use a table to find (and reuse) constants when parsing

llimits.h

@@ -1,5 +1,5 @@
 /*
-** $Id: llimits.h,v 1.29 2001/06/05 18:17:01 roberto Exp roberto $
+** $Id: llimits.h,v 1.30 2001/06/05 20:01:09 roberto Exp roberto $
 ** Limits, basic types, and some other `installation-dependent' definitions
 ** See Copyright Notice in lua.h
 */
@@ -124,10 +124,4 @@ typedef unsigned long Instruction;
 
 
 
-/* maximum lookback to find a real constant (for code generation) */
-#ifndef LOOKBACKNUMS
-#define LOOKBACKNUMS    40      /* arbitrary constant */
-#endif
-
-
 #endif