[llvm] [IR] Allow poison argument to lifetime markers (PR #151148)

[Matt Arsenault via llvm-commits]

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@@ -7598,7 +7598,9 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
     if (TM.getOptLevel() == CodeGenOptLevel::None)
       return;
 
-    const AllocaInst *LifetimeObject = cast<AllocaInst>(I.getArgOperand(1));
+    const AllocaInst *LifetimeObject = dyn_cast<AllocaInst>(I.getArgOperand(1));
+    if (!LifetimeObject)
+      return;
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arsenm wrote:

Missing tests? 

https://github.com/llvm/llvm-project/pull/151148