[llvm] [MachineBlockPlacement][X86] Use max of MDAlign and TLIAlign to align Loops. (PR #71026)

[Vito Kortbeek via llvm-commits]

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@@ -151,6 +151,53 @@ MachineLoopInfo::findLoopPreheader(MachineLoop *L, bool SpeculativePreheader,
   return Preheader;
 }
 
+MDNode *MachineLoop::getLoopID() const {
+  MDNode *LoopID = nullptr;
+  if (const auto *MBB = findLoopControlBlock()) {
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kortbeek-snps wrote:

Downstream we noticed that the `LoopID` can't be found for some loops because `findLoopControlBlock()` returns the exiting block. Should this not be `getLoopLatch()`?

https://github.com/llvm/llvm-project/pull/71026