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/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -894,6 +894,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
       runTest("compiler/testData/codegen/box/arrays/constantArrayOfAny.kt");
     }
 
+    @TestMetadata("emptyArrayDesugaring.kt")
+    public void testEmptyArrayDesugaring() {
+      runTest("compiler/testData/codegen/box/arrays/emptyArrayDesugaring.kt");
+    }
+
     @TestMetadata("forEachBooleanArray.kt")
     public void testForEachBooleanArray() {
       runTest("compiler/testData/codegen/box/arrays/forEachBooleanArray.kt");