Don't report EXPERIMENTAL_OVERRIDE_ERROR on annotated local functions

#KT-31728 Fixed

compiler/testData/diagnostics/testsWithStdLib/experimental/overrideInAnonymousObject.kt

@@ -0,0 +1,23 @@
+// FIR_IDENTICAL
+// !USE_EXPERIMENTAL: kotlin.RequiresOptIn
+
+@RequiresOptIn
+@Retention(AnnotationRetention.BINARY)
+@Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION)
+annotation class MyAnn
+
+interface MyInterface {
+    @MyAnn
+    fun foo()
+
+    @MyAnn
+    fun bar()
+}
+
+val field = object : MyInterface {
+    @MyAnn
+    override fun foo() {}
+
+    @OptIn(MyAnn::class)
+    override fun bar() {}
+}