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i#3044: AArch64 sve codec: add sqadd, sqsub, sub, subr, uqadd and uqsub

Merged Administrator requested to merge i3044-add-sqadd-etc into master

Created by: joshua-warburton

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

SQADD   <Zdn>.<Ts>, <Zdn>.<Ts>, #<imm>, <shift>
SQADD   <Zd>.<Ts>, <Zn>.<Ts>, <Zm>.<Ts>
SQSUB   <Zdn>.<Ts>, <Zdn>.<Ts>, #<imm>, <shift>
SQSUB   <Zd>.<Ts>, <Zn>.<Ts>, <Zm>.<Ts>
SUB     <Zdn>.<Ts>, <Pg>/M, <Zdn>.<Ts>, <Zm>.<Ts>
SUB     <Zdn>.<Ts>, <Zdn>.<Ts>, #<imm>, <shift>
SUB     <Zd>.<Ts>, <Zn>.<Ts>, <Zm>.<Ts>
SUBR    <Zdn>.<Ts>, <Pg>/M, <Zdn>.<Ts>, <Zm>.<Ts>
SUBR    <Zdn>.<Ts>, <Zdn>.<Ts>, #<imm>, <shift>
UQADD   <Zdn>.<Ts>, <Zdn>.<Ts>, #<imm>, <shift>
UQADD   <Zd>.<Ts>, <Zn>.<Ts>, <Zm>.<Ts>
UQSUB   <Zdn>.<Ts>, <Zdn>.<Ts>, #<imm>, <shift>
UQSUB   <Zd>.<Ts>, <Zn>.<Ts>, <Zm>.<Ts>

issues: #3044