Added more tests on incorporation

compiler/testData/constraintSystem/severalVariables/other/constraintForNullables.bounds

@@ -0,0 +1,23 @@
+VARIABLES T P
+
+SUBTYPE T? P?
+SUBTYPE P Int
+
+type parameter bounds:
+T <: P?*, <: P*, <: Int, <: Int?
+P >: T*, <: Int
+
+status:
+-hasCannotCaptureTypesError: false
+-hasConflictingConstraints: false
+-hasContradiction: false
+-hasErrorInConstrainingTypes: false
+-hasTypeConstructorMismatch: false
+-hasTypeInferenceIncorporationError: false
+-hasUnknownParameters: false
+-hasViolatedUpperBound: false
+-isSuccessful: true
+
+result:
+T=Int
+P=Int