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i#3044 AArch64 SVE codec: Add horizontal reduction instructions

Merged Administrator requested to merge i3044-aarch64-sve-horizontal-reduction into master

Created by: joshua-warburton

This patch adds the appropriate macros, tests and codec entries to encode the following variants:

ANDV    <V><d>, <Pg>, <Zn>.<Ts>
EORV    <V><d>, <Pg>, <Zn>.<Ts>
FADDA   <V><dn>, <Pg>, <V><dn>, <Zm>.<Ts>
FADDV   <V><d>, <Pg>, <Zn>.<Ts>
FMAXNMV <V><d>, <Pg>, <Zn>.<Ts>
FMAXV   <V><d>, <Pg>, <Zn>.<Ts>
FMINNMV <V><d>, <Pg>, <Zn>.<Ts>
FMINV   <V><d>, <Pg>, <Zn>.<Ts>
ORV     <V><d>, <Pg>, <Zn>.<Ts>
SADDV   <Dd>, <Pg>, <Zn>.<Ts>
SMAXV   <V><d>, <Pg>, <Zn>.<Ts>
SMINV   <V><d>, <Pg>, <Zn>.<Ts>
UADDV   <Dd>, <Pg>, <Zn>.<Ts>
UMAXV   <V><d>, <Pg>, <Zn>.<Ts>
UMINV   <V><d>, <Pg>, <Zn>.<Ts>

issue: #3044