[llvm] [BranchFolding] Fix assertion failure in HoistCommonCodeInSuccs (PR #141028)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

> LLVM Buildbot has detected a new failure on builder `lldb-x86_64-debian` running on `lldb-x86_64-debian` while building `llvm` at step 6 "test".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/162/builds/22936
> 
> Here is the relevant piece of the build log for the reference

Seems like a flaky test (prev and next are green)

https://github.com/llvm/llvm-project/pull/141028