Fix IrFunction.isEmptyArray implementation

The previous one was incorrect for K1 since parent of top-level function
is `IrClass`, not `IrPackageFragment`.

The change is non-functional, K1 still worked correctly, but had to do
some extra work when inlining `emptyArray` calls and produces less
performant bytecode.

compiler/testData/codegen/box/annotations/instances/annotationToString.kt

@@ -10,7 +10,6 @@
 // WITH_STDLIB
 // !LANGUAGE: +InstantiationOfAnnotationClasses
 
-// JVM_ABI_K1_K2_DIFF: KT-62465
 
 package test