Even in the restricted config, we can still end up having to print
certain non-allocatable registers, e.g. if required by a FIXED_REGISTER
policy. The names list needs to contain all general register names.

Change-Id: I70104d6ba02779437de14eca01dc1900c159aa6a
Reviewed-on: https://chromium-review.googlesource.com/1184846Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55308}