Added more tests on incorporation

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

@@ -0,0 +1,26 @@
+VARIABLES T P E
+
+SUBTYPE T P
+SUBTYPE P E
+SUBTYPE E Int
+
+type parameter bounds:
+T <: P*, <: E*, <: Int
+P >: T*, <: E*, <: Int
+E >: T*, >: P*, <: 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
+E=Int