[AArch64][SVE2] Asm: support SVE Bitwise Logical - Unpredicated Group

Summary:
Patch adds support for the following instructions:
    * EOR3, BSL, BCAX, BSL1N, BSL2N, NBSL, XAR

Aliases for types .B/.H/.S for EOR3 and BCAX have been added, the
preferred disassembly is .D.

The specification can be found here:
https://developer.arm.com/docs/ddi0602/latest

Reviewed By: SjoerdMeijer

Differential Revision: https://reviews.llvm.org/D62387

llvm-svn: 361936