IR: extract & rename getTopLevelDeclaration() to IrLazyFunctionBase

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/lazy/AbstractFir2IrLazyFunction.kt

@@ -123,18 +123,10 @@ abstract class AbstractFir2IrLazyFunction<F : FirCallableDeclaration>(
     private fun tryLoadIr(): Boolean {
         if (!isInline || isFakeOverride) return false
         if (!extensions.irNeedsDeserialization) return false
-        val toplevel = getToplevel()
+        val toplevel = getTopLevelDeclaration()
         return (toplevel as? DeserializableClass)?.loadIr() ?: false
     }
 
-    private fun getToplevel(): IrDeclaration {
-        var current: IrDeclaration = this
-        while (current.parent !is IrPackageFragment) {
-            current = current.parent as IrDeclaration
-        }
-        return current
-    }
-
     companion object {
         private val JVM_STATIC_CLASS_ID = ClassId.topLevel(JVM_STATIC_ANNOTATION_FQ_NAME)
     }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/lazy/IrLazyFunction.kt

@@ -113,18 +113,10 @@ class IrLazyFunction(
     private fun tryLoadIr(): Boolean {
         if (!stubGenerator.extensions.irDeserializationEnabled) return false
         if (!isInline || isFakeOverride) return false
-        val toplevel = getToplevel()
+        val toplevel = getTopLevelDeclaration()
         return (toplevel as? DeserializableClass)?.loadIr() ?: false
     }
 
-    private fun getToplevel(): IrDeclaration {
-        var current: IrDeclaration = this
-        while (current.parent !is IrPackageFragment) {
-            current = current.parent as IrDeclaration
-        }
-        return current
-    }
-
     init {
         symbol.bind(this)
     }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/lazy/IrLazyFunctionBase.kt

@@ -9,9 +9,7 @@ import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.ReceiverParameterDescriptor
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
-import org.jetbrains.kotlin.ir.declarations.IrFunction
-import org.jetbrains.kotlin.ir.declarations.IrTypeParametersContainer
-import org.jetbrains.kotlin.ir.declarations.IrValueParameter
+import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.name.Name
@@ -22,6 +20,14 @@ interface IrLazyFunctionBase : IrLazyDeclarationBase, IrTypeParametersContainer
 
     val initialSignatureFunction: IrFunction?
 
+    fun getTopLevelDeclaration(): IrDeclaration {
+        var current: IrDeclaration = this
+        while (current.parent !is IrPackageFragment) {
+            current = current.parent as IrDeclaration
+        }
+        return current
+    }
+
     fun createInitialSignatureFunction(): Lazy<IrFunction?> =
         // Need SYNCHRONIZED; otherwise two stubs generated in parallel may fight for the same symbol.
         lazy(LazyThreadSafetyMode.SYNCHRONIZED) {