removed AutoCastReceiver

check subtype for receiver by AutoCastUtils.isSubTypeByAutoCast directly
 #KT-4403 Fixed
 #KT-4415 Fixed

compiler/testData/diagnostics/tests/smartCasts/inference/kt4415.kt

@@ -0,0 +1,17 @@
+//KT-4415 Class Auto-Cast Bug
+
+trait SelfJson
+
+object A {
+    fun find(<!UNUSED_PARAMETER!>clz<!>:Class<*>){  }
+
+    fun toJson2(obj:Any){
+        if(obj is SelfJson){
+            // A.find( (obj as SelfJson).javaClass)  // OK
+            A.find( <!DEBUG_INFO_AUTOCAST!>obj<!>.javaClass )   // ERROR:  Type mismatch: inferred type is jet.Any but SelfJson was expected
+        }
+    }
+}
+
+//from library
+val <T> T.javaClass : Class<T> get() = throw Exception()