Improve diagnostic on overload resolution ambiguity

Report type mismatch on argument when a nullable argument is passed to non-null parameter.

 Note that this affects only functions with simple types without generics

 #KT-2007 Fixed
 #KT-9282 Fixed

compiler/testData/diagnostics/tests/smartCasts/varnotnull/plusplusMinusminus.kt

@@ -14,7 +14,7 @@ fun bar(arg: Long?): Long {
         return i<!UNSAFE_CALL!>--<!> <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>+<!> i
     }
     if (i++ == 7L) {
-        return i++ <!NONE_APPLICABLE!>+<!> i
+        return i++ <!UNSAFE_OPERATOR_CALL!>+<!> <!TYPE_MISMATCH!>i<!>
     }
     return 0L
 }