+extern void print_current_pass (FILE *);
+extern void debug_pass (void);
+
+/* Set to true if the pass is called the first time during compilation of the
+ current function. Note that using this information in the optimization
+ passes is considered not to be clean, and it should be avoided if possible.
+ This flag is currently used to prevent loops from being peeled repeatedly
+ in jump threading; it will be removed once we preserve loop structures
+ throughout the compilation -- we will be able to mark the affected loops
+ directly in jump threading, and avoid peeling them next time. */
+extern bool first_pass_instance;