[llvm] [ms] [llvm-ml] Add llvm-ml64 alias (PR #131854)

[Eric Astor via llvm-commits]

ericastor wrote:

> Looking good overall, one comment about the tests.
> 
> It may be good to add to the commit message, that the logic for doing this already happened to exist in the code, we just didn't install such aliases yet.

Good idea; I'll try to remember to add that to the final commit message when I merge.

https://github.com/llvm/llvm-project/pull/131854