[llvm] [RISCV] Move RISCVVType namespace to TargetParser (PR #83222)

[Wang Pengcheng via llvm-commits]

wangpc-pp wrote:

There are some failures: https://lab.llvm.org/buildbot/#/builders/57/builds/33206
Fix is here: https://github.com/llvm/llvm-project/pull/84109

https://github.com/llvm/llvm-project/pull/83222