Improve build times by generating less IR (#1192)

* example

* `MethodRouter::merge`

* `set_content_length` and `set_allow_header`

* `MethodRouter::on_service_boxed_response_body`

* `Router::route`

* `MethodRouter::merge` again

* `MethodRouter::on_service_boxed_response_body`

* `Router::call_route`

* `MethodRouter::{layer, route_layer}`

* revert example

* fix test

* move function to method on `AllowHeader`

axum/CHANGELOG.md

@@ -34,18 +34,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `NoMatchingMethodFilter` error in case of failure ([#1130])
 - **added:** Document how to run extractors from middleware ([#1140])
 
-=======
-  `axum-macros`
-- **added:** Support any middleware response that implements `IntoResponse` ([#1152])
-- **breaking:** Require middleware added with `Handler::layer` to have
-  `Infallible` as the error type ([#1152])
-
-[#1171]: https://github.com/tokio-rs/axum/pull/1171
-[#1077]: https://github.com/tokio-rs/axum/pull/1077
-[#1088]: https://github.com/tokio-rs/axum/pull/1088
-[#1102]: https://github.com/tokio-rs/axum/pull/1102
-[#1119]: https://github.com/tokio-rs/axum/pull/1119
->>>>>>> 73041c8 (Avoid exposure of type names by QueryRejection (#1171))
 [#1130]: https://github.com/tokio-rs/axum/pull/1130
 [#1140]: https://github.com/tokio-rs/axum/pull/1140