[llvm] [ReachingDefAnalysis] Extend the analysis to stack objects. (PR #118097)

[Michael Maitland via llvm-commits]

https://github.com/michaelmaitland commented:

Can you please add a test that contains virtual registers? I think this is needed in order to do reaching def analysis prior to register allocation?

https://github.com/llvm/llvm-project/pull/118097