This patch refactors the lxsdx generator. Resuable code is isolated
into a macro.  The macro will be used in subsequent patches in this
series to implement other scalar load instructions.
Signed-off-by: NTom Musta <tommusta@gmail.com>
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NAlexander Graf <agraf@suse.de>