[AArch64][SVE2] Add intrinsics for binary narrowing operations
Summary:
The following intrinsics for binary narrowing add and sub operations are
added:
* @llvm.aarch64.sve.addhnb
* @llvm.aarch64.sve.addhnt
* @llvm.aarch64.sve.raddhnb
* @llvm.aarch64.sve.raddhnt
* @llvm.aarch64.sve.subhnb
* @llvm.aarch64.sve.subhnt
* @llvm.aarch64.sve.rsubhnb
* @llvm.aarch64.sve.rsubhnt
Reviewers: sdesmalen, rengolin, efriedma
Reviewed By: sdesmalen, efriedma
Subscribers: tschuett, kristof.beyls, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D71424
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