i#3044 AArch64 SVE codec: Add MOV, MOVS, PFALSE, PFIRST, PTRUE, PTRUES, SEL

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

PFALSE  <Pd>.B
PFIRST  <Pdn>.B, <Pg>, <Pdn>.B
SEL     <Pd>.B, <Pg>, <Pn>.B, <Pm>.B
SEL     <Zd>.<Ts>, <Pv>, <Zn>.<Ts>, <Zm>.<Ts>
MOV     <Pd>.B, <Pn>.B
MOVS    <Pd>.B, <Pg>/Z, <Pn>.B
PTRUE   <Pd>.<Ts>{, <pattern>}
PTRUES  <Pd>.<Ts>{, <pattern>}

Issue #3044