IR: remove JVM-specific methods from DeclarationFactory

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/DeclarationFactory.kt

@@ -6,14 +6,11 @@
 package org.jetbrains.kotlin.backend.common.ir
 
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.types.IrType
 
 interface DeclarationFactory {
     object FIELD_FOR_OUTER_THIS : IrDeclarationOriginImpl("FIELD_FOR_OUTER_THIS", isSynthetic = true)
 
-    fun getFieldForEnumEntry(enumEntry: IrEnumEntry): IrField
     fun getOuterThisField(innerClass: IrClass): IrField
     fun getInnerClassConstructorWithOuterThisParameter(innerClassConstructor: IrConstructor): IrConstructor
     fun getInnerClassOriginalPrimaryConstructorOrNull(innerClass: IrClass): IrConstructor?
-    fun getFieldForObjectInstance(singleton: IrClass): IrField
-}
+}