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

[Craig Topper via llvm-commits]

================
@@ -138,6 +141,13 @@ class ReachingDefAnalysis : public MachineFunctionPass {
   DenseMap<MachineInstr *, int> InstIds;
 
   MBBReachingDefsInfo MBBReachingDefs;
+  using MBBFrameObjsReachingDefsInfo =
+      std::vector<std::vector<std::vector<int>>>;
----------------
topperc wrote:

Can the last std::vector<int> be SmallVector<int>? I assume its usually doesn't contain many values since for a given frame index, it's usually not defined by many blocks?

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