don't report unnecessary smart cast on receiver

compiler/testData/diagnostics/tests/inference/regressions/kt1358.kt

@@ -3,8 +3,8 @@ package d
 
 fun bar(a: Any?) {
     if (a != null) {
-        <!DEBUG_INFO_AUTOCAST!>a<!>.foo() //overload resolution ambiguity
-        <!DEBUG_INFO_AUTOCAST!>a<!>.sure() //overload resolution ambiguity
+        a.foo() //overload resolution ambiguity
+        a.sure() //overload resolution ambiguity
     }
 }
 

compiler/testData/diagnostics/tests/infos/Autocasts.kt

@@ -183,7 +183,7 @@ fun returnFunctionLiteral(a: Any?): Function0<Int> =
 fun mergeAutocasts(a: Any?) {
   if (a is String || a is Int) {
     a.<!UNRESOLVED_REFERENCE!>compareTo<!>("")
-    <!DEBUG_INFO_AUTOCAST!>a<!>.toString()
+    a.toString()
   }
   if (a is Int || a is String) {
     a.<!UNRESOLVED_REFERENCE!>compareTo<!>("")

compiler/testData/diagnostics/tests/smartCasts/noUnnecessarySmartCastForReceiver.kt

@@ -0,0 +1,7 @@
+fun Any?.foo() {}
+
+fun test(a: Any?) {
+    if (a != null) {
+        a.foo()
+    }
+}