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

^KT-44241 Fixed

compiler/testData/codegen/box/inference/builderInference/intersect.kt

@@ -1,7 +1,6 @@
 // !LANGUAGE: +UnrestrictedBuilderInference
 // WITH_RUNTIME
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_FIR: JVM_IR
 // DONT_TARGET_EXACT_BACKEND: WASM
 
 // FILE: Test.java
@@ -37,15 +36,6 @@ fun box(): String {
         intersect(getIn(), Test.foo(getIn()))
         intersect(Test.foo(getIn()), Test.foo(getIn()))
         intersect(Test.foo(getIn()), getIn())
-
-        build2 {
-            emit(1)
-            intersect(this@build.getIn(), getIn())
-            intersect(getIn(), Test.foo(this@build.getIn()))
-            intersect(Test.foo(this@build.getIn()), Test.foo(getIn()))
-            intersect(Test.foo(getIn()), this@build.getIn())
-            ""
-        }
         ""
     }
     return "OK"