opt: Track data flow information about predicates

This allows us to optimize things like

    -sparse -o -not -sparse <==> -true

and

    -sparse -a -not -sparse <==> -false

1 files changed, 2 insertions, 2 deletions

diff --git a/parse.c b/parse.c
index d5c0128..8269d22 100644
--- a/parse.c
+++ b/parse.c
@@ -1759,7 +1759,7 @@ static struct expr *parse_nogroup(struct parser_state *state, int arg1, int arg2
 
 	struct expr *expr = parse_nullary_test(state, eval_nogroup);
 	if (expr) {
-		expr->cost = 9000.0;
+		expr->cost = STAT_COST;
 		expr->probability = 0.01;
 	}
 	return expr;
@@ -1793,7 +1793,7 @@ static struct expr *parse_nouser(struct parser_state *state, int arg1, int arg2)
 
 	struct expr *expr = parse_nullary_test(state, eval_nouser);
 	if (expr) {
-		expr->cost = 9000.0;
+		expr->cost = STAT_COST;
 		expr->probability = 0.01;
 	}
 	return expr;