[clang] [llvm] [RISCV][llvm] Rename zvqdotq to zvdot4a8i (PR #179393)

[Sam Elliott via cfe-commits]

https://github.com/lenary approved this pull request.

LGTM. Wait for approval from someone else too as this is a huge rename.

https://github.com/llvm/llvm-project/pull/179393