[llvm] [StackColoring] Delete dead stack slots (PR #72633)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Could you please commit the code on my behalf? Mohammed Nurul Hoque [mohammed.nurulhoque at imgtec.com](mailto:mohammed.nurulhoque at imgtec.com)

Can you fix the formatting error?

https://github.com/llvm/llvm-project/pull/72633