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This bug would manifest in some very specific cases where all the following conditions are fullfilled: - GVN didn't remove block - The regular GVN iteration didn't change the IR - PRE is enabled - PRE will not split critical edge - The last instruction processed by PRE didn't change the IR Because the CallGraph PassManager relies on this returned value to decide if it needs to recompute a node after the execution of Function passes, not returning the right value can lead to unexpected results. Fix for: https://llvm.org/bugs/show_bug.cgi?id=24715 Patch by Wenxiang Qiu <vincentqiuuu@gmail.com> From: Mehdi Amini <mehdi.amini@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253518 91177308-0d34-0410-b5e6-96231b3b80d8
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