[llvm] [InstCombine] Don't check uses of constant exprs (PR #113684)

[Mikael Holmén via llvm-commits]

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@@ -3753,7 +3753,7 @@ Instruction *InstCombinerImpl::visitBranchInst(BranchInst &BI) {
   }
 
   // Replace all dominated uses of the condition with true/false
-  if (BI.getSuccessor(0) != BI.getSuccessor(1)) {
+  if (!isa<Constant>(Cond) && BI.getSuccessor(0) != BI.getSuccessor(1)) {
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mikaelholmen wrote:

Maybe add a comment about why we must avoid Constants ?

https://github.com/llvm/llvm-project/pull/113684