[llvm] [WIP][CodeGen] Modifying MBB's liveins representation as into regUnits (PR #129847)

[Jay Foad via llvm-commits]

jayfoad wrote:

> > > > So, anyone taking care of it as of now
> > > 
> > > 
> > > No-one is working on it, as far as I know.
> > 
> > 
> > Its quiet easy to achieve from implemetation point of view (cannot say the same if its have conceptually implication at big). So, I am just in the process of trying it locally.
> 
> It worked as expected, should I proceed with it as a PR for review @jayfoad !

Sure.

https://github.com/llvm/llvm-project/pull/129847