[clang] [Clang] Introduce 'clang-nvlink-wrapper' to work around 'nvlink' (PR #96561)

[Artem Belevich via cfe-commits]

Artem-B wrote:

@nico: 
> Why do we need a new binary for this, instead of having something like `clang -cc1_nvlink` that calls a custom mode within clang?

Do we have existing precedents for such built-in tools, other than cc1 itself? If the linker wrapper can be part of clang itself, it would make some things easier logistically.

https://github.com/llvm/llvm-project/pull/96561