[llvm] [CodeGen] Preserved additional analyses in StackSlotColoring pass. (PR #93779)

[Vikash Gupta via llvm-commits]

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@@ -152,6 +154,14 @@ namespace {
       AU.addRequired<MachineBlockFrequencyInfo>();
       AU.addPreserved<MachineBlockFrequencyInfo>();
       AU.addPreservedID(MachineDominatorsID);
+
+      // In some Target's pipeline, register allocation (RA) might be
+      // split into multiple phases based on register class. So, this pass
+      // may be invoked multiple times requiring it to save these analyses to be
+      // used by RA later.
+      AU.addPreserved<LiveIntervals>();
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vg0204 wrote:

addPreserved<SlotIndexes> was already there before. As for LiveIntervals, it would be needed to be preserved for maybe the upcoming regAlloc pass for remaining register classes, else it is being re-computed, which somehow creating problem. 

https://github.com/llvm/llvm-project/pull/93779