JVM IR: cast indy-SAM receiver type from KFunctionN to FunctionN

#KT-46512 Fixed

compiler/testData/codegen/box/funInterface/kt46512_indyFunInterfaceOverCallableReference.kt

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+// IGNORE_BACKEND: WASM
+
+class C : Comparable<C> {
+    override fun compareTo(other: C): Int = 0
+}
+
+fun box(): String {
+    val comparator = Comparable<C>::compareTo
+    return if (nullsFirst(comparator).compare(C(), C()) == 0) "OK" else "Fail"
+}