[llvm][aarch64] SVE addressing modes.

Summary:
Added register + immediate and register + register addressing modes for the following intrinsics:

1. Masked load and stores:
     * Sign and zero extended load and truncated stores.
     * No extension or truncation.
2. Masked non-temporal load and store.

Reviewers: andwar, efriedma

Subscribers: cameron.mcinally, sdesmalen, tschuett, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D74254