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452bd5f9c6
not properly handle the case where the predecessor block was the entry block to the function. The only in-tree client of this is JumpThreading, which worked around the issue in its own code. This patch moves the solution into the helper so that JumpThreading (and other clients) do not have to replicate the same fix everywhere. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212875 91177308-0d34-0410-b5e6-96231b3b80d8
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