[llvm] [LICM] Drop nsw/nuw flags on affected instructions in hoistMulAddAssociation. (PR #85486)

[Nikita Popov via llvm-commits]

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@@ -2735,6 +2737,12 @@ static bool hoistMulAddAssociation(Instruction &I, Loop &L,
   if (Changes.empty())
     return false;
 
+  // Drop the poison flags for any adds we looked through.
+  if (I.getType()->isIntOrIntVectorTy()) {
+    for (auto *Add : Adds)
+      Add->dropPoisonGeneratingFlags();
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nikic wrote:

I think the flag drop on the adds does not have test coverage?

https://github.com/llvm/llvm-project/pull/85486