Support mapping between Java and Kotlin reflection objects

compiler/testData/codegen/boxWithStdlib/reflection/mapping/extensionProperty.kt

@@ -0,0 +1,27 @@
+import kotlin.reflect.jvm.*
+import kotlin.test.assertEquals
+
+class K(var value: Long)
+
+var K.ext: Double
+    get() = value.toDouble()
+    set(value) {
+        this.value = value.toLong()
+    }
+
+fun box(): String {
+    val p = K::ext
+
+    val getter = p.javaGetter!!
+    val setter = p.javaSetter!!
+
+    assertEquals(getter, Class.forName("_DefaultPackage").getMethod("getExt", javaClass<K>()))
+    assertEquals(setter, Class.forName("_DefaultPackage").getMethod("setExt", javaClass<K>(), javaClass<Double>()))
+
+    val k = K(42L)
+    assert(getter.invoke(null, k) == 42.0, "Fail k getter")
+    setter.invoke(null, k, -239.0)
+    assert(getter.invoke(null, k) == -239.0, "Fail k setter")
+
+    return "OK"
+}