This is the last 6.x version of Drush, so we might as well stabilize it. To do any real testing of this, you need a Drupal website handy, but for what it's worth, I've been using it on amd64 for a long time. The package is pure PHP so it should work the same on x86.
amd64 stable
Dear Maintainer (or who is mainly involved in this stable request), This is an auto-generated message that will move the current component to the new component Stabilization. To ensure that the stabilization will proceed correctly, please fill the fields "Atoms to stabilize" and "Runtime testing required" as described here: https://archives.gentoo.org/gentoo-dev/message/4b2ef0e9aa7588224b8ae799c5fe31fa
x86 stable. Closing.
