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/jvmOverloads/noRedundantVarargs.jvm_abi.txt

@@ -1,26 +0,0 @@
-MODULE main
-	CLASS TestKt.class
-		Annotation: class.invisibleAnnotations
-			K1
-				@Lkotlin/jvm/internal/SourceDebugExtension;( value: #{ SMAP
-				test.kt
-				Kotlin
-				*S Kotlin
-				*F
-				+ 1 test.kt
-				TestKt
-				+ 2 ArrayIntrinsics.kt
-				kotlin/ArrayIntrinsicsKt
-				*L
-				1#1,28:1
-				26#2:29
-				*S KotlinDebug
-				*F
-				+ 1 test.kt
-				TestKt
-				*L
-				9#1:29
-				*E
-				 } )
-			K2
-				---

compiler/testData/codegen/box/jvmOverloads/noRedundantVarargs.kt

@@ -1,7 +1,6 @@
 // TARGET_BACKEND: JVM
 // WITH_STDLIB
 // FULL_JDK
-// JVM_ABI_K1_K2_DIFF: KT-62465
 
 // FILE: test.kt