[llvm] [RISCV] Track the value range of vsetvlimax (PR #218313)

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

> to a more exact one.

Done in https://github.com/llvm/llvm-project/pull/218652.

I will investigate what is left in this PR after the TTI change.

https://github.com/llvm/llvm-project/pull/218313