Support Void.TYPE as underlying Class object for KClass

#KT-20875 Fixed

compiler/testData/codegen/box/reflection/classes/javaVoid.kt

@@ -0,0 +1,17 @@
+// IGNORE_BACKEND: JS, NATIVE
+// WITH_REFLECT
+
+import kotlin.reflect.KClass
+import kotlin.test.assertEquals
+
+fun box(): String {
+    assertEquals(Void::class, Void.TYPE.kotlin)
+    assertEquals(Void.TYPE.kotlin, Void::class)
+
+    assertEquals(Void.TYPE, Void::class.javaPrimitiveType)
+    assertEquals(Void::class.java, Void::class.javaObjectType)
+    assertEquals(Void.TYPE, Void.TYPE.kotlin.javaPrimitiveType)
+    assertEquals(Void::class.java, Void.TYPE.kotlin.javaObjectType)
+
+    return "OK"
+}