ccaeebcd04
Builtins for reading the streaming vector length are canonicalised to use the aarch64.sme.cntsd intrinisic and a multiply, i.e. - cntsb -> cntsd * 8 - cntsh -> cntsd * 4 - cntsw -> cntsd * 2 This patch also removes the LLVM intrinsics for cnts[b,h,w], and adds patterns to improve codegen when cntsd is multiplied by a constant.