http://bugs.python.org/issue2459 -- speed up loops

Objects/codeobject.c

Index: Objects/codeobject.c
===================================================================
--- Objects/codeobject.c	(revision 70087)
+++ Objects/codeobject.c	(working copy)
@@ -629,7 +629,7 @@
                 addr += *p++;
                 if (*p) 
                         bounds->ap_lower = addr;
-                line += *p++;
+                line += (signed char) *p++;
                 --size;
         }