Prohibit check for instance of a non-reified, non-subtype type parameter

#KT-12683 Fixed
 #KT-9986 Fixed

compiler/testData/diagnostics/tests/cast/IsErasedUpcastToNonReified.kt

@@ -0,0 +1,27 @@
+fun <T, S : T> test(x: T?, y: S, z: T) {
+    x is <!CANNOT_CHECK_FOR_ERASED!>T<!>
+    x is T?
+
+    y is T
+    y is S
+    y is T<!USELESS_NULLABLE_CHECK!>?<!>
+    y is S<!USELESS_NULLABLE_CHECK!>?<!>
+
+    z is T
+    z is T<!USELESS_NULLABLE_CHECK!>?<!>
+
+    <!UNCHECKED_CAST!>null as T<!>
+    null <!USELESS_CAST!>as T?<!>
+    <!UNCHECKED_CAST!>null as S<!>
+}
+
+inline fun <reified T> test(x: T?) {
+    x is T
+    null as T
+    null <!USELESS_CAST!>as T?<!>
+}
+
+fun <T> foo(x: List<T>, y: List<T>?) {
+    x is List<T>
+    y is List<T>
+}