Implement KClass.getProperties()

#KT-6570 In Progress

compiler/testData/codegen/boxWithStdlib/reflection/properties/fakeOverridesInSubclass.kt

@@ -0,0 +1,12 @@
+import kotlin.reflect.jvm.*
+import kotlin.test.*
+
+open class Super(val r: String)
+
+class Sub(r: String) : Super(r)
+
+fun box(): String {
+    val props = javaClass<Sub>().kotlin.getProperties()
+    assertEquals(listOf("r"), props.map { it.name })
+    return props.single().get(Sub("OK")).toString()
+}