[AArch64][SVE2] Asm: add integer pairwise arithmetic instructions

Summary:
Patch adds support for the following instructions:

    ADDP, SMAXP, UMAXP, SMINP, UMINP

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

Reviewed By: SjoerdMeijer

Differential Revision: https://reviews.llvm.org/D62128

llvm-svn: 361229