[AArch64][SVE] Asm: Add restricted register classes for SVE predicate vectors.

Summary:
Add a register class for SVE predicate operands that can only be p0-p7 (as opposed to p0-p15)

Patch [1/3] in a series to add predicated ADD/SUB instructions for SVE.

Reviewers: rengolin, mcrosier, evandro, fhahn, echristo, olista01, SjoerdMeijer, javed.absar

Reviewed By: fhahn

Subscribers: aemerson, javed.absar, tschuett, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D41441

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321699 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed