More correct comparison with CANT_INFER_FUNCTION_PARAM_TYPE

compiler/testData/diagnostics/tests/functionAsExpression/MissingParameterTypes.txt

@@ -1,6 +1,6 @@
 package
 
-internal val a: (???) -> [ERROR : Cannot be inferred]
+internal val a: (???) -> ???
 internal val b: (kotlin.Int) -> kotlin.Int
 internal val c: (kotlin.Int, kotlin.String) -> kotlin.Int
 internal val d: (kotlin.Int, kotlin.String) -> kotlin.Int

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt

@@ -180,7 +180,7 @@ internal class DescriptorRendererImpl(
     private fun renderInflexibleType(type: JetType): String {
         assert(!type.isFlexible()) { "Flexible types not allowed here: " + renderNormalizedType(type) }
 
-        if (type identityEquals CANT_INFER_FUNCTION_PARAM_TYPE || TypeUtils.isDontCarePlaceholder(type)) {
+        if (type == CANT_INFER_FUNCTION_PARAM_TYPE || TypeUtils.isDontCarePlaceholder(type)) {
             return "???"
         }
         if (ErrorUtils.isUninferredParameter(type)) {