Changed the way the constraints are written in tests

SUBTYPE T Int -> T <: Int

compiler/testData/constraintSystem/severalVariables/interdependency/interdependency1.bounds

@@ -1,9 +1,9 @@
 VARIABLES T P E
 FIX_VARIABLES
 
-SUBTYPE P My<T>
-SUBTYPE Successor<E> P
-SUBTYPE Int T
+P <: My<T>
+Successor<E> <: P
+Int <: T
 
 type parameter bounds:
 T := T*, := E*, >: Int, := Int