JDK-8347706 is not the first issue opened to address out of order #include statements and as long as ordering requirements[1] are not checked automatically, it probably won't be the last. It should not be too hard to come up with a bash script that can be run as part of jcheck to do this checking.

[1] https://github.com/openjdk/jdk/blob/df9210e6578acd53384ee1ac06601510c9a52696/doc/hotspot-style.md?plain=1#L141-L148