[K/N][IR][codegen] Made lazy init logic JVM-like

Now a file will be initialized only if a top level function has been called
rather than any function like was before the commit

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

@@ -404,7 +404,7 @@ fun IrFunction.isMethodOfAny(): Boolean =
                 else -> false
             }
 
-fun IrClass.simpleFunctions() = declarations.flatMap {
+fun IrDeclarationContainer.simpleFunctions() = declarations.flatMap {
     when (it) {
         is IrSimpleFunction -> listOf(it)
         is IrProperty -> listOfNotNull(it.getter, it.setter)