[llvm] [RISCV] Change RISCVMCExpr::VK_RISCV_None to RISCVMCExpr::VK_None (PR #131774)

[via llvm-commits]

hchandel wrote:

> LGTM - please either get this committed asap or revert #130779 as you are breaking most buildbots at the moment

@RKSimon I am waiting for the checks to pass. Only one check is remaining. I can merge this without waiting for that check?

https://github.com/llvm/llvm-project/pull/131774