[llvm] [BPF] Remove 'may_goto 0' instructions (PR #123482)

[via llvm-commits]

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@@ -682,6 +685,65 @@ bool BPFMIPreEmitPeephole::insertMissingCallerSavedSpills() {
   return Changed;
 }
 
+bool BPFMIPreEmitPeephole::removeMayGotoZero() {
+  bool Changed = false;
+  MachineBasicBlock *Prev_MBB, *Curr_MBB = nullptr;
+  MachineBasicBlock *ToErase = nullptr;
+
+  for (MachineBasicBlock &MBB : reverse(*MF)) {
+    if (ToErase) {
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eddyz87 wrote:

Note: there is a utility function `llvm::make_early_inc_range`, I think it could be used here to avoid the `ToErase` variable.

https://github.com/llvm/llvm-project/pull/123482