Forbid dynamic on the RHS of is and as

compiler/testData/diagnostics/tests/dynamicTypes/dynamicCastTarget.kt

@@ -0,0 +1,32 @@
+// !DIAGNOSTICS: -REDUNDANT_NULLABLE
+
+// MODULE[js]: m1
+// FILE: k.kt
+
+fun test(d: Any, dl: Collection<dynamic>) {
+    d as <!DYNAMIC_NOT_ALLOWED!>dynamic<!>
+    d as <!DYNAMIC_NOT_ALLOWED!>dynamic?<!>
+
+    d as? <!DYNAMIC_NOT_ALLOWED!>dynamic<!>
+    d as? <!DYNAMIC_NOT_ALLOWED!>dynamic?<!>
+
+    d is <!DYNAMIC_NOT_ALLOWED!>dynamic<!>
+    d is <!DYNAMIC_NOT_ALLOWED!>dynamic?<!>
+
+    d !is <!DYNAMIC_NOT_ALLOWED!>dynamic<!>
+    d !is <!DYNAMIC_NOT_ALLOWED!>dynamic?<!>
+
+    when (d) {
+        is <!DYNAMIC_NOT_ALLOWED!>dynamic<!> -> {}
+        is <!DYNAMIC_NOT_ALLOWED!>dynamic?<!> -> {}
+        !is <!DYNAMIC_NOT_ALLOWED!>dynamic<!> -> {}
+        !is <!DYNAMIC_NOT_ALLOWED!>dynamic?<!> -> {}
+    }
+
+    dl as List<dynamic>
+    dl is List<dynamic>
+
+    when (dl) {
+        is List<dynamic> -> {}
+    }
+}

compiler/testData/diagnostics/tests/dynamicTypes/dynamicCastTarget.txt

@@ -0,0 +1,3 @@
+package
+
+internal fun test(/*0*/ d: kotlin.Any, /*1*/ dl: kotlin.Collection<dynamic>): kotlin.Unit