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Summary: The old code did eliminate references from and to functions that were about to be deleted only just before we deleted them. This can cause references from other functions that are supposed to be deleted to still exist, depending on the order. If the functions form a strongly connected component the problem manifests regardless of the order in which we try to actually delete the functions. This patch introduces a two step deletion. First we remove all references and then we delete the function. Note that this only affects the old call graph. There should not be any functional changes if no old style call graph was given. To test this we delete two strongly connected functions instead of one in an existing test. Reviewers: hfinkel Subscribers: hiraditya, bollu, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D77975
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