Pass KProperty instances to property delegates

Inherit KProperty from PropertyMetadata, cache corresponding KProperty objects
instead of PropertyMetadataImpl objects, add support for properties with 2
receivers

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KProperty2Impl.kt

@@ -17,6 +17,8 @@
 package kotlin.reflect.jvm.internal
 
 import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import kotlin.jvm.internal.MutablePropertyReference2
+import kotlin.jvm.internal.PropertyReference2
 import kotlin.reflect.KMutableProperty2
 import kotlin.reflect.KProperty2
 
@@ -34,7 +36,7 @@ internal open class KProperty2Impl<D, E, out R> : DescriptorBasedProperty<R>, KP
     }
 }
 
-internal class KMutableProperty2Impl<D, E, R> : KProperty2Impl<D, E, R>, KMutableProperty2<D, E, R>, KMutablePropertyImpl<R> {
+internal open class KMutableProperty2Impl<D, E, R> : KProperty2Impl<D, E, R>, KMutableProperty2<D, E, R>, KMutablePropertyImpl<R> {
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : super(container, name, signature)
 
     constructor(container: KDeclarationContainerImpl, descriptor: PropertyDescriptor) : super(container, descriptor)
@@ -47,3 +49,32 @@ internal class KMutableProperty2Impl<D, E, R> : KProperty2Impl<D, E, R>, KMutabl
         override fun invoke(receiver1: D, receiver2: E, value: R): Unit = property.set(receiver1, receiver2, value)
     }
 }
+
+
+internal class KProperty2FromReferenceImpl(
+        val reference: PropertyReference2
+) : KProperty2Impl<Any?, Any?, Any?>(
+        reference.owner as KDeclarationContainerImpl,
+        reference.name,
+        reference.signature
+) {
+    override val name: String get() = reference.name
+
+    override fun get(receiver1: Any?, receiver2: Any?): Any? = reference.get(receiver1, receiver2)
+}
+
+internal class KMutableProperty2FromReferenceImpl(
+        val reference: MutablePropertyReference2
+) : KMutableProperty2Impl<Any?, Any?, Any?>(
+        reference.owner as KDeclarationContainerImpl,
+        reference.name,
+        reference.signature
+) {
+    override val name: String get() = reference.name
+
+    override fun get(receiver1: Any?, receiver2: Any?): Any? = reference.get(receiver1, receiver2)
+
+    override fun set(receiver1: Any?, receiver2: Any?, value: Any?) {
+        reference.set(receiver1, receiver2, value)
+    }
+}

core/reflection.jvm/src/kotlin/reflect/jvm/internal/ReflectionFactoryImpl.java

@@ -70,14 +70,12 @@ public class ReflectionFactoryImpl extends ReflectionFactory {
 
     @Override
     public KProperty2 property2(PropertyReference2 p) {
-        // TODO: support member extension property references
-        return p;
+        return new KProperty2FromReferenceImpl(p);
     }
 
     @Override
     public KMutableProperty2 mutableProperty2(MutablePropertyReference2 p) {
-        // TODO: support member extension property references
-        return p;
+        return new KMutableProperty2FromReferenceImpl(p);
     }
 
     // Deprecated