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/inlineArgsInPlace/arrayDequeRemoveAll.kt

@@ -1,5 +1,5 @@
 // WITH_STDLIB
-// JVM_ABI_K1_K2_DIFF: KT-62464, KT-63984
+// JVM_ABI_K1_K2_DIFF: KT-63984
 
 @Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
 class ArrayDeque<E> : AbstractMutableList<E> {