[clang] [llvm] [RISCV] Add support for vector registers with -fzero-call-used-regs (PR #206206)

[Lucas Chollet via llvm-commits]

LucasChollet wrote:

@topperc Do you want to wait for another reviewer to chime in, or should we merge that right away?

https://github.com/llvm/llvm-project/pull/206206