Support KPackage.members, functions and properties

compiler/testData/codegen/boxWithStdlib/reflection/packages/simpleGetMembers.kt

@@ -0,0 +1,23 @@
+import kotlin.reflect.*
+import kotlin.reflect.jvm.*
+import kotlin.test.assertEquals
+
+fun foo() {}
+fun Int.bar() {}
+val baz = 42
+val Int.quux: Int get() = this
+
+fun box(): String {
+    fun check(actual: Collection<KCallable<*>>, expected: Set<String>) {
+        assertEquals(expected, actual.map { it.name }.toSet())
+    }
+
+    val kp = Class.forName("_DefaultPackage").kotlinPackage ?: return "Fail: package class not found"
+
+    check(kp.members, setOf("bar", "baz", "foo", "box", "quux"))
+    check(kp.functions, setOf("bar", "foo", "box"))
+    check(kp.properties, setOf("baz"))
+    check(kp.extensionProperties, setOf("quux"))
+
+    return "OK"
+}