v.util: add an iabs(x) helper (#9172)

vlib/v/util/util.v

@@ -363,6 +363,11 @@ pub fn imax(a int, b int) int {
 	return if a > b { a } else { b }
 }
 
+[inline]
+pub fn iabs(v int) int {
+	return if v > 0 { v } else { -v }
+}
+
 pub fn replace_op(s string) string {
 	if s.len == 1 {
 		last_char := s[s.len - 1]