[FIR] Consider getter and setter for CANNOT_WEAKEN_ACCESS_PRIVILEGE

Fill source with correct value instead of null
for FirDefaultPropertySetter in light tree converter

compiler/testData/diagnostics/tests/OverridenSetterVisibility.fir.kt

@@ -1,29 +0,0 @@
-public interface ITest {
-    public var prop : Int
-        get() = 12
-        set(value) {}
-}
-
-abstract class ATest {
-    protected open var prop2 : Int
-        get() = 13
-        set(value) {}
-}
-
-class Test: ATest(), ITest {
-    override var prop : Int
-        get() = 12
-        private set(value) {}
-
-    override var prop2 : Int
-        get() = 14
-        <!SETTER_VISIBILITY_INCONSISTENT_WITH_PROPERTY_VISIBILITY!>internal<!> set(value) {}
-}
-
-fun main() {
-    val test = Test()
-    <!INVISIBLE_SETTER!>test.prop<!> = 12
-
-    val itest: ITest = test
-    itest.prop = 12 // No error here
-}

compiler/testData/diagnostics/tests/OverridenSetterVisibility.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 public interface ITest {
     public var prop : Int
         get() = 12

compiler/testData/diagnostics/tests/PrivateSetterForOverridden.fir.kt

@@ -1,70 +0,0 @@
-// See KT-10325: private setters are allowed for overridden properties in final class
-
-interface A {
-    val a: Int
-
-    var b: Int
-}
-
-abstract class AA {
-    abstract val c: Int
-
-    abstract var d: Int
-}
-
-class B : A, AA() {
-    override var a: Int = 0
-        // Ok
-        private set
-
-    override var b: Int = 1
-        private set
-
-    override var c: Int = 2
-        // Ok
-        private set
-
-    override var d: Int = 3
-        private set
-}
-
-open class C : A, AA() {
-    override var a: Int = 0
-        // Errors here and below
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set
-
-    override var b: Int = 1
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set
-
-    override var c: Int = 2
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set
-
-    override var d: Int = 3
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set
-}
-
-abstract class D : A, AA() {
-    override var a: Int = 0
-        // Errors here and below
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set
-
-    override var b: Int = 1
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set
-
-    override var c: Int = 2
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set
-
-    override var d: Int = 3
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set
-}
-
-interface E : A {
-    override var a: Int
-        get() = 0
-        // Errors here and below
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set(arg) {}
-
-    override var b: Int
-        get() = 0
-        <!PRIVATE_SETTER_FOR_OPEN_PROPERTY!>private<!> set(arg) {}
-}

compiler/testData/diagnostics/tests/PrivateSetterForOverridden.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // See KT-10325: private setters are allowed for overridden properties in final class
 
 interface A {