Should we use GCC11 for building Alpine JDK19+?

[sxa]

#2990 highlighted an issue where an upgrade to the docker base image from 3.15 to 3.16 bumped the GCC version from 10 to 11. This was fixed by locking the version of the build container to 3.15 so it continued to use the GCC10 compiler built into that Alpine version.

On (non-Alpine) Linux/x64 we use different compiler versions based on the java versions. Should we do the same for Alpine? Since we've already shipped versions of all JDKs up to 17 on GCC10 I'm ok with leaving them as-is, but we have recently bumped Linux platforms up to GCC11, and we could do the same for Alpine.

I've got a built version of GCC11.2 for Alpine/x64 at https://ci.adoptopenjdk.net/userContent/gcc/gcc112.alpinex64.tar.xz and it appears to work ok for building JDK head on Alpine 3.15 (Built with --disable-libsanitizer) NOTE: I haven't got a working one for Alpine/aarch64 yet.

This issue should cover whether we want to do it and any subsequent PRs to this repository and infrastructure covering any required PRs.