[clang] [nvlink-wrapper] Use a symbolic link instead of copying the file (PR #110139)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> @rnk Are symlinks OK to use on windows?

There's a caveat in the implementation stating that the links are soft on Linux but hard on Windows (as soft links require super-user privileges). I'm pretty sure a hard link also does the job here? Since all we need to do is give the same data a different filename.

https://github.com/llvm/llvm-project/pull/110139