FIR checker: warn useless as and is

compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos/59.fir.kt

@@ -139,7 +139,7 @@ fun case_10() {
  */
 fun case_11() {
     var x: Any? = null
-    x as? Any ?: null!!
+    x <!USELESS_CAST!>as? Any<!> ?: null!!
     do {
         <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
         x = x<!UNSAFE_CALL!>.<!>equals(10)
@@ -187,7 +187,7 @@ fun case_14() {
     do {
         <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
         x = x<!UNSAFE_CALL!>.<!>equals(10)
-    } while (x is Any)
+    } while (<!USELESS_IS_CHECK!>x is Any<!>)
 }
 
 /*
@@ -201,6 +201,6 @@ fun case_15() {
         do {
             <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
             x = x <!UNSAFE_CALL!>.<!>equals(10)
-        } while (x is Any)
+        } while (<!USELESS_IS_CHECK!>x is Any<!>)
     }
 }