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/arrays/kt17134.kt

@@ -1,8 +1,6 @@
 // WITH_STDLIB
 // TARGET_BACKEND: JVM
 
-// JVM_ABI_K1_K2_DIFF: KT-62465
-
 object A {
     @JvmStatic fun main(args: Array<String>) {
         val b = arrayOf(arrayOf(""))