Replace some FIR syntax errors with more proper diagnostics

compiler/testData/diagnostics/tests/secondaryConstructors/constructorInObject.fir.kt

@@ -1,17 +1,17 @@
 object A {
-    constructor()
+    <!CONSTRUCTOR_IN_OBJECT!>constructor()<!>
     init {}
 }
 
 enum class B {
     X() {
-        <!UNRESOLVED_REFERENCE!>constructor()<!>
+        <!CONSTRUCTOR_IN_OBJECT, UNRESOLVED_REFERENCE!>constructor()<!>
     }
 }
 
 class C {
     companion object {
-        constructor()
+        <!CONSTRUCTOR_IN_OBJECT!>constructor()<!>
     }
 }