[llvm] [CodeGen] Preserve LiveStack analysis in StackSlotColoring pass (PR #94967)

[Vikash Gupta via llvm-commits]

vg0204 wrote:

So, considering all this I am just refelcting whether its worthwhile to preserve liveStacks, as once used by SCC in middle, it may be of no use to later upcoming RA passes(as they themselves enter their own stack spills livenes to be later maybe used by SCC). So one probable solution in my suggestion could be reset the LS results.

https://github.com/llvm/llvm-project/pull/94967