FIR checker: report VIRTUAL_MEMBER_HIDDEN

compiler/testData/diagnostics/tests/override/MultipleDefaultParametersInSupertypesNoOverride.fir.kt

@@ -1,15 +0,0 @@
-interface X {
-    fun foo(a : Int = 1)
-}
-
-interface Y {
-    fun foo(a : Int = 1)
-}
-
-class Z : X, Y {
-    fun foo(a : Int) {}
-}
-
-object ZO : X, Y {
-    fun foo(a : Int) {}
-}

compiler/testData/diagnostics/tests/override/MultipleDefaultParametersInSupertypesNoOverride.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 interface X {
     fun foo(a : Int = 1)
 }

compiler/testData/diagnostics/tests/override/NonGenerics.fir.kt

@@ -36,8 +36,8 @@ class MyChildClass() : MyClass() {}
 }
 
 <!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED!>class MyIllegalClass4<!>() : MyTrait, MyAbstractClass() {
-    fun foo() {}
-    <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val pr : Unit<!>
+    fun <!VIRTUAL_MEMBER_HIDDEN!>foo<!>() {}
+    <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val <!VIRTUAL_MEMBER_HIDDEN!>pr<!> : Unit<!>
     override fun other() {}
     override val otherPr : Int = 1
 }