[llvm] [RISCV] Handle .vx/.vi pseudos in hasAllNBitUsers (PR #67419)

[Philip Reames via llvm-commits]

preames wrote:

I reverted this change.  The stylistic changes made after approval deserve separate discussion.  You may reland the approved version.  Please move the stylistic change to it's own review.  

https://github.com/llvm/llvm-project/pull/67419