[tree generator] Remove AbstractField.defaultValueInBase

It is now unneeded, and future needs should be possible to
be resolved otherwise.
Removing it will simplify further changes to tree generator,
especially for IR.

compiler/ir/ir.tree/tree-generator/src/org/jetbrains/kotlin/ir/generator/model/Field.kt

@@ -32,7 +32,6 @@ sealed class Field(
 
     override var withGetter: Boolean = false
 
-    override var defaultValueInBase: String? = null
     override var defaultValueInImplementation: String? = null
     override var defaultValueInBuilder: String?
         get() = null
@@ -58,7 +57,6 @@ sealed class Field(
     override fun updateFieldsInCopy(copy: Field) {
         super.updateFieldsInCopy(copy)
         copy.withGetter = withGetter
-        copy.defaultValueInBase = defaultValueInBase
         copy.defaultValueInImplementation = defaultValueInImplementation
         copy.customUseInIrFactoryStrategy = customUseInIrFactoryStrategy
         copy.customSetter = customSetter

generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/AbstractElementPrinter.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -52,7 +52,7 @@ abstract class AbstractElementPrinter<Element : AbstractElement<Element, Field,
                 withIndent {
                     for (field in filterFields(element)) {
                         if (field.isParameter) continue
-                        if (!field.withGetter && field.defaultValueInImplementation == null && field.defaultValueInBase == null && field.isFinal && field.fromParent) {
+                        if (!field.withGetter && field.defaultValueInImplementation == null && field.isFinal && field.fromParent) {
                             continue
                         }
                         if (separateFieldsWithBlankLine) println()
@@ -60,7 +60,7 @@ abstract class AbstractElementPrinter<Element : AbstractElement<Element, Field,
                             field,
                             inImplementation = false,
                             override = field.fromParent,
-                            modality = Modality.ABSTRACT.takeIf { !field.isFinal && !kind.isInterface && field.defaultValueInBase == null },
+                            modality = Modality.ABSTRACT.takeIf { !field.isFinal && !kind.isInterface },
                         )
                     }
                     printAdditionalMethods(element)

generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/AbstractField.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -50,7 +50,6 @@ abstract class AbstractField<Field : AbstractField<Field>> {
     open val containsElement: Boolean
         get() = typeRef is ElementOrRef<*> || this is ListField && baseType is ElementOrRef<*>
 
-    open val defaultValueInBase: String? get() = null
     open val defaultValueInImplementation: String? get() = null
 
     /**

generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/AbstractFieldPrinter.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -42,7 +42,7 @@ abstract class AbstractFieldPrinter<Field : AbstractField<*>>(
         modality: Modality? = null,
     ) {
         printer.run {
-            val defaultValue = if (inImplementation) field.defaultValueInImplementation else field.defaultValueInBase
+            val defaultValue = if (inImplementation) field.defaultValueInImplementation else null
             printPropertyDeclaration(
                 name = field.name,
                 type = actualTypeOfField(field),

generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/AbstractImplementation.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -73,11 +73,11 @@ abstract class AbstractImplementation<Implementation, Element, Field>(
     }
 
     private fun withDefault(field: Field) =
-        !field.isFinal && (field.defaultValueInImplementation != null || field.defaultValueInBase != null || field.isLateinit)
+        !field.isFinal && (field.defaultValueInImplementation != null || field.isLateinit)
 
     val fieldsInConstructor by lazy { allFields.filterNot(::withDefault) }
 
-    val fieldsInBody by lazy { allFields.filter(::withDefault).filter { it.defaultValueInBase == null } }
+    val fieldsInBody by lazy { allFields.filter(::withDefault) }
 
     var requiresOptIn = false