Annotations on type aliases: generate synthetic method for type alias annotations.

compiler/testData/codegen/box/annotations/annotationsOnTypeAliases.kt

@@ -0,0 +1,31 @@
+// WITH_RUNTIME
+// FULL_JDK
+
+import kotlin.annotation.AnnotationTarget.*
+import kotlin.annotation.AnnotationRetention.*
+import java.lang.Class
+
+@Target(TYPEALIAS)
+@Retention(RUNTIME)
+annotation class Ann(val x: Int)
+
+class C {
+    @Ann(1)
+    typealias TA = Any
+}
+
+@Ann(2)
+typealias TA = Any
+
+fun Class<*>.assertHasDeclaredMethodWithAnn() {
+    if (!declaredMethods.any { it.isSynthetic && it.getAnnotation(Ann::class.java) != null }) {
+        throw java.lang.AssertionError("Class ${this.simpleName} has no declared method with annotation @Ann")
+    }
+}
+
+fun box(): String {
+    Class.forName("AnnotationsOnTypeAliasesKt").assertHasDeclaredMethodWithAnn()
+    Class.forName("C").assertHasDeclaredMethodWithAnn()
+
+    return "OK"
+}