[PATCH] D70597: [PHIEliminate] skip dbg instruction when LowerPHINode

[Jeremy Morse via Phabricator via llvm-commits]

jmorse added a comment.

I wrote inline:

> Wouldn't a block that has no PHIs or labels end up returning MBB2.begin()? Applying std::prev to that would break.

Running check-llvm, there are a bunch of crashes, for example llvm/test/CodeGen/X86/win-catchpad.ll so there's certainly something breaking there.


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https://reviews.llvm.org/D70597