Fix reflection internal error on enum nested classes query

#KT-10520 Fixed

compiler/testData/codegen/boxWithStdlib/reflection/classes/companionObject.kt

@@ -5,6 +5,11 @@ class A {
     companion object C
 }
 
+enum class E {
+    ENTRY;
+    companion object {}
+}
+
 fun box(): String {
     val obj = A::class.companionObject
     assertNotNull(obj)
@@ -16,5 +21,7 @@ fun box(): String {
     assertNull(A.C::class.companionObject)
     assertNull(A.C::class.companionObjectInstance)
 
+    assertEquals(E.Companion, E::class.companionObjectInstance)
+
     return "OK"
 }

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KClassImpl.kt

@@ -120,7 +120,8 @@ internal class KClassImpl<T : Any>(override val jClass: Class<T>) : KDeclaration
         }
 
     override val nestedClasses: Collection<KClass<*>>
-        get() = descriptor.unsubstitutedInnerClassesScope.getContributedDescriptors().map { nestedClass ->
+        get() = descriptor.unsubstitutedInnerClassesScope.getContributedDescriptors().filterNot(DescriptorUtils::isEnumEntry).map {
+            nestedClass ->
             val source = (nestedClass as DeclarationDescriptorWithSource).source
             when (source) {
                 is KotlinJvmBinarySourceElement ->