[clang] [Driver] Group together usage of AddAllArgs (PR #68349)

[Fangrui Song via cfe-commits]

MaskRay wrote:

Replace with `AddAllArgs` with `addAllArgs` while you are changing these lines. Most `*Arg` options actually use the proper lower-case but some `Add*` ones are weird...

https://github.com/llvm/llvm-project/pull/68349