[std] add AOverload (#9818)

std/haxe/macro/Expr.hx

@@ -867,6 +867,11 @@ enum Access {
 		Abstract access modifier.
 	**/
 	AAbstract;
+
+	/**
+		Overload access modifier.
+	**/
+	AOverload;
 }
 
 /**

std/haxe/macro/Printer.hx

@@ -160,6 +160,7 @@ class Printer {
 			case AFinal: "final";
 			case AExtern: "extern";
 			case AAbstract: "abstract";
+			case AOverload: "overload";
 		}
 
 	public function printField(field:Field) {