IR: descriptor-less rendering of IR elements (work in progress)

compiler/testData/ir/irText/expressions/whenElse.txt

@@ -1,7 +1,7 @@
 FILE fqName:<root> fileName:/whenElse.kt
-  FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.Int flags:[]
+  FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.Int 
     BLOCK_BODY
-      RETURN type=kotlin.Nothing from='FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.Int flags:[]'
+      RETURN type=kotlin.Nothing from='public final fun test (): kotlin.Int declared in <root>'
         WHEN type=kotlin.Int origin=WHEN
           BRANCH
             if: CONST Boolean type=kotlin.Boolean value=true