[clang] [Clang][Driver] Add new flags to control machine instruction verification (PR #70282)

[Arthur Eubanks via cfe-commits]

aeubanks wrote:

We can still pass `-mllvm` for LTO builds.

If we have a more lightweight version, then I wonder if we just fold that under the previous verification flag.

Yeah I'd hold off on this until we have a more compelling reason to add it.

https://github.com/llvm/llvm-project/pull/70282