================
@@ -2333,6 +2352,170 @@ DwarfDebug::emitInitialLocDirective(const 
MachineFunction &MF, unsigned CUID) {
   return PrologEndLoc;
 }
 
+void DwarfDebug::findKeyInstructions(const MachineFunction *MF) {
+  // New function - reset KeyInstructions.
+  KeyInstructions.clear();
+
+  // The current candidate is_stmt instructions for each source atom.
+  // Map {(InlinedAt, Group): (Rank, Instructions)}.
+  DenseMap<std::pair<DILocation *, uint32_t>,
+           std::pair<uint16_t, SmallVector<const MachineInstr *>>>
+      GroupCandidates;
----------------
jmorse wrote:

This will be big due to each dense-map element containing a SmallVector of 
pointers; IMO we need to do some profiling and set a SmallVector allocation 
size.

https://github.com/llvm/llvm-project/pull/133495
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