Added diagnostic tests for inference and incorporation

compiler/testData/diagnostics/tests/inference/commonSystem/genericCandidateInGenericClass.kt

@@ -0,0 +1,9 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class GenericClass<out T>(val value: T) {
+    public fun foo<P>(extension: T.() -> P) {}
+}
+
+public fun <E> GenericClass<List<E>>.bar() {
+    foo( { listIterator() })
+}