[llvm][SVE] IR intrinsics for quadword permutation instructions.

Summary:
Adding intrinsics and codegen patterns for:

* trn1 <Zd>.q, <Zm>.q, <Zn>.q
* trn2 <Zd>.q, <Zm>.q, <Zn>.q
* zip1 <Zd>.q, <Zm>.q, <Zn>.q
* zip2 <Zd>.q, <Zm>.q, <Zn>.q
* uzp1 <Zd>.q, <Zm>.q, <Zn>.q
* uzp2 <Zd>.q, <Zm>.q, <Zn>.q

These instructions are defined in Armv8.6-A.

Reviewers: sdesmalen, efriedma, kmclaughlin

Reviewed By: sdesmalen

Subscribers: tschuett, kristof.beyls, hiraditya, rkruppe, psnobl, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D80850