[clang] [flang] [flang] Add -f[no-]vectorize flags (PR #119718)

[Tarun Prabhu via cfe-commits]

https://github.com/tarunprabhu requested changes to this pull request.

Please move code to be shared between `clang` and `flang` to `clang/lib/Driver/ToolChains/CommonArgs.cpp`

https://github.com/llvm/llvm-project/pull/119718