[llvm] [NFC] Various Cleanup in StackColoring, StackSlotColoring, LiveStacks (PR #143931)

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@@ -40,49 +40,43 @@ class LiveStacks {
   ///
   VNInfo::Allocator VNInfoAllocator;
 
-  /// S2IMap - Stack slot indices to live interval mapping.
-  using SS2IntervalMap = std::unordered_map<int, LiveInterval>;
-  SS2IntervalMap S2IMap;
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Ralender wrote:

Ok, https://github.com/llvm/llvm-project/pull/165477

https://github.com/llvm/llvm-project/pull/143931