deprecating types after colon

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/BinaryExpressionElvis.kt

@@ -1,14 +1,16 @@
+// !CHECK_TYPE
+
 fun foo(x: Int?): Int = x!!
 
 fun elvis(x: Number?): Int {
     val result = (x as Int?) ?: foo(<!DEBUG_INFO_SMARTCAST!>x<!>)
-    <!DEBUG_INFO_SMARTCAST!>x<!> : Int?
+    checkSubtype<Int?>(<!DEBUG_INFO_SMARTCAST!>x<!>)
     return result
 }
 
 
 fun elvisWithRHSTypeInfo(x: Number?): Any? {
     val result = x ?: x!!
-    <!TYPE_MISMATCH!>x<!> : Int?
+    checkSubtype<Int?>(<!TYPE_MISMATCH!>x<!>)
     return result
 }