[llvm] [CodeGen] Refactor DeadMIElim isDead and GISel isTriviallyDead (PR #105956)

[Tobias Stadler via llvm-commits]

================
@@ -1725,6 +1730,10 @@ class MachineInstr
   /// the instruction's location and its intended destination.
   bool isSafeToMove(bool &SawStore) const;
 
+  /// Return true if this instruction can be considered dead if all of its
+  /// defined registers are dead.
+  bool canBeDead() const;
----------------
tobias-stadler wrote:

Done. Thanks!

https://github.com/llvm/llvm-project/pull/105956