Introduce KProperty{0,1,2}.getDelegate

#KT-8384 In Progress

compiler/testData/codegen/box/reflection/properties/getDelegate/memberExtensionProperty.kt

@@ -0,0 +1,29 @@
+// IGNORE_BACKEND: JS
+// WITH_REFLECT
+
+import kotlin.reflect.*
+import kotlin.reflect.jvm.isAccessible
+import kotlin.test.*
+
+object Delegate {
+    var storage = ""
+    operator fun getValue(instance: Any?, property: KProperty<*>) = storage
+    operator fun setValue(instance: Any?, property: KProperty<*>, value: String) { storage = value }
+}
+
+class Bar
+
+class Foo {
+    var Bar.result: String by Delegate
+}
+
+fun box(): String {
+    val foo = Foo()
+    val bar = Bar()
+    with(foo) { bar.result = "Fail" }
+    val prop = Foo::class.members.single { it.name == "result" } as KMutableProperty2<Foo, Bar, String>
+    val d = prop.apply { isAccessible = true }.getDelegate(foo, bar) as Delegate
+    with(foo) { bar.result = "OK" }
+    assertEquals(d, prop.apply { isAccessible = true }.getDelegate(foo, bar))
+    return d.getValue(foo, prop)
+}