We created those builds out in the open initially because they're just tracking upstream gcc.
Then we were told to hide them because their presence would reveal we're working on something, but at that point, android-build didn't have support for toolchain builds in the restricted area.

By the time this was added, aarch64 support had already gone into gcc-linaro, so there's no use in the upstream aarch64 builds anymore.

Unless we want to start tracking upstream gcc for some reason, those builds are obsolete and can be removed.

ttyl
bero