Allow IrConstTransformer to visit and evaluate vararg elements

compiler/testData/ir/irText/declarations/annotations/constExpressionsInAnnotationArguments.fir.txt

@@ -38,9 +38,9 @@ FILE fqName:<root> fileName:/constExpressionsInAnnotationArguments.kt
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
   FUN name:test1 visibility:public modality:FINAL <> () returnType:kotlin.Unit
     annotations:
-      A(x = CALL 'public final fun <get-ONE> (): kotlin.Int declared in <root>' type=kotlin.Int origin=GET_PROPERTY)
+      A(x = '1')
     BLOCK_BODY
   FUN name:test2 visibility:public modality:FINAL <> () returnType:kotlin.Unit
     annotations:
-      A(x = CALL 'public final fun plus (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=null)
+      A(x = '2')
     BLOCK_BODY