[llvm] [RISCV][CFI] Emit cfi_offset for every callee-saved vector registers (PR #100455)

[Paul Kirth via llvm-commits]

ilovepi wrote:

LGTM from me. I'll let @topperc make the final call, but I like this approach much better. Also, thanks for fixing this up!

https://github.com/llvm/llvm-project/pull/100455