[llvm-branch-commits] [RISCV][TTI] Adjust the cost of `llvm.abs` intrinsic when `Zvabd` exists (PR #180146)

[Pengcheng Wang via llvm-branch-commits]

https://github.com/wangpc-pp created https://github.com/llvm/llvm-project/pull/180146

When `Zvabd` exists, `llvm.abs` is lowered to `vabs.v` so the cost
is 1.