Rewrite AnnotationCodegen to generate annotation arguments by AnnotationDescriptor

compiler/testData/codegen/boxWithStdlib/annotations/varargInAnnotationParameter.kt

@@ -0,0 +1,21 @@
+import java.lang.annotation.Retention
+import java.lang.annotation.RetentionPolicy
+
+Retention(RetentionPolicy.RUNTIME)
+annotation class Ann(val s: String, vararg val p: Int)
+
+Ann("str", 1, 2, 3) class MyClass
+
+fun box(): String {
+    val ann = javaClass<MyClass>().getAnnotation(javaClass<Ann>())
+    if (ann == null) return "fail: cannot find Ann on MyClass"
+    if (ann.s != "str") return "fail: annotation parameter s should be \"str\""
+    if (ann.p[0] != 1) return "fail: annotation parameter p[0] should be 1"
+    if (ann.p[1] != 2) return "fail: annotation parameter p[1] should be 2"
+    if (ann.p[2] != 3) return "fail: annotation parameter p[2] should be 3"
+    return "OK"
+}
+
+fun main(args: Array<String>) {
+    println(box())
+}