Restore support for local class literals in annotation arguments

This was broken in c1ab08c8ce where we started to represent KClassValue
as a ClassId of the referenced class + number of times it's been wrapped
into kotlin.Array. Local classes do not have a sane ClassId, so in this
change we restore the old behavior by representing KClassValue with a
sealed class value instead

 #KT-29891 Fixed

compiler/testData/serialization/local/annotationsInLocalClass.kt

@@ -1,14 +1,25 @@
 // CLASS_NAME_SUFFIX: A$foo$Local
 
+import kotlin.reflect.KClass
+
 class A {
     annotation class Ann(val info: String)
 
-    fun foo() {
-        @Ann("class") class Local {
-            @Ann("fun") fun foo(): Local = this
-            @field:Ann("val") val x = foo()
+    annotation class Bnn(val klass: KClass<*>)
 
-            @Ann("inner") inner class Inner
+    fun foo() {
+        @Ann("class")
+        class Local {
+            @Ann("fun")
+            fun foo(): Local = this
+
+            @field:Ann("val")
+            @Bnn(Local::class)
+            val x = foo()
+
+            @Ann("inner")
+            @Bnn(Array<Array<out Local>>::class)
+            inner class Inner
         }
     }
 }

compiler/testData/serialization/local/annotationsInLocalClass.txt

@@ -1,9 +1,9 @@
 @A.Ann(info = "class") local final class `A$foo$Local`
 
 public constructor `A$foo$Local`()
-@field:A.Ann(info = "val") public final val x: `A$foo$Local`
+@A.Bnn(klass = A$foo$Local::class) @field:A.Ann(info = "val") public final val x: `A$foo$Local`
 @A.Ann(info = "fun") public final fun foo(): `A$foo$Local`
 
-@A.Ann(info = "inner") local final inner class Inner {
+@A.Ann(info = "inner") @A.Bnn(klass = kotlin.Array<kotlin.Array<A$foo$Local>>::class) local final inner class Inner {
     public constructor Inner()
 }