[llvm] [DA] Add option to run only SIV routines (PR #157084)

[Ryotaro Kasuga via llvm-commits]

kasuga-fj wrote:

So, the above comments are just quick thoughts I had. If we do decide to go with this approach, it would require some more careful consideration (and possibly an RFC?). I'd like to move forward with this PR independently, as it's necessary to expose and fix existing bugs in DA.

@Meinersbur Could you please take a look? Thanks in advance!

https://github.com/llvm/llvm-project/pull/157084