Add constraints between two different stub variables instead of creating constraint error due to T1 isn't subtype of T2

^KT-44241 Fixed

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java

@@ -17653,6 +17653,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
                 runTest("compiler/testData/codegen/box/inference/builderInference/commonSuperTypeNullable.kt");
             }
 
+            @Test
+            @TestMetadata("constraintsBetweenTwoStubVariables.kt")
+            public void testConstraintsBetweenTwoStubVariables() throws Exception {
+                runTest("compiler/testData/codegen/box/inference/builderInference/constraintsBetweenTwoStubVariables.kt");
+            }
+
             @Test
             @TestMetadata("intersect.kt")
             public void testIntersect() throws Exception {
@@ -17671,6 +17677,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
                 runTest("compiler/testData/codegen/box/inference/builderInference/kt42139.kt");
             }
 
+            @Test
+            @TestMetadata("kt44241.kt")
+            public void testKt44241() throws Exception {
+                runTest("compiler/testData/codegen/box/inference/builderInference/kt44241.kt");
+            }
+
             @Test
             @TestMetadata("kt47052.kt")
             public void testKt47052() throws Exception {