intrinsic-test: Reverse has_constraints() condition

It seems it returns true when *no* constraints are found, opposite to
the expected behavior of the function name.

This commit reverses condition as the name suggests.

Author: a4lg

crates/intrinsic-test/src/common/argument.rs

@@ -42,7 +42,7 @@ where
     }
 
     pub fn has_constraint(&self) -> bool {
-        self.constraint.is_none()
+        self.constraint.is_some()
     }
 
     pub fn type_and_name_from_c(arg: &str) -> (&str, &str) {