[llvm] [MachineSink] Add option for aggressive loop sinking (PR #117247)

[Matt Arsenault via llvm-commits]

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@@ -679,6 +692,10 @@ void MachineSinking::FindCycleSinkCandidates(
     SmallVectorImpl<MachineInstr *> &Candidates) {
   for (auto &MI : *BB) {
     LLVM_DEBUG(dbgs() << "CycleSink: Analysing candidate: " << MI);
+    if (MI.isDebugInstr()) {
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arsenm wrote:

Should this be more broadly isMetaInstruction? 

https://github.com/llvm/llvm-project/pull/117247