[KeyInstr][NFC] Fix incorrect atomGroup/rank uint size in computeKeyInstructions

Author: OCHyams

llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -2368,8 +2368,8 @@ void DwarfDebug::computeKeyInstructions(const MachineFunction *MF) {
   // Map {(InlinedAt, Group): (Rank, Instructions)}.
   // NOTE: Anecdotally, for a large C++ blob, 99% of the instruction
   // SmallVectors contain 2 or fewer elements; use 2 inline elements.
-  DenseMap<std::pair<DILocation *, uint32_t>,
-           std::pair<uint16_t, SmallVector<const MachineInstr *, 2>>>
+  DenseMap<std::pair<DILocation *, uint64_t>,
+           std::pair<uint8_t, SmallVector<const MachineInstr *, 2>>>
       GroupCandidates;
 
   // For each instruction: