Implement more aarch64 vector insns:
CM{EQ,HI,HS,GE,GT,TST,LE,LT} (vector)
{EOR,BSL,BIT,BIF} (vector)
{USHR,SSHR} (vector, immediate)
{U,S}SHLL{,2}
INS (general)
FABD Vd,Vn,Vm



git-svn-id: svn://svn.valgrind.org/vex/trunk@2820 8f6e269a-dfd6-0310-a8e1-e2731360e62c