xz: add arch-specific tuning for alpha

Alpha has fixed-length, 4-byte-aligned instructions and no XZ BCJ
filter, so it wants the same LZMA2 settings as the other 4-byte-aligned
targets. Without an entry it hits the default case, which warns

  scripts/xz_wrap.sh: Arch-specific tuning is missing for 'alpha'

and conservatively assumes 2-byte alignment. Alpha gains HAVE_KERNEL_XZ
later in this series; the correct alignment also shrinks a UP1500
kernel's XZ image from 6469320 to 6448840 bytes.

Signed-off-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Reviewed-by: Lasse Collin <lasse.collin@tukaani.org>
Link: https://lore.kernel.org/r/20261017-alpha-kernel-compression-v2-1-c71e6b08dc63@gmail.com
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>

0 files changed, 0 insertions, 0 deletions