[PATCH] D121580: [SCCP] Fix crash when function arg is a unused basic block's address

[Nick Desaulniers via Phabricator via llvm-commits]

nickdesaulniers added a comment.

The issue is in [`runIPSCCP`](https://github.com/llvm/llvm-project/blob/687d20de7ffc69dd4ecdb9808aeb6d3cffcf3871/llvm/lib/Transforms/Scalar/SCCP.cpp#L500-L533). We don't clean up uses of any `BlockAddress`es before deleting the `BasicBlock` that's dead.  So we basically need to do the same transform that was observed here <https://github.com/llvm/llvm-project/issues/54238#issuecomment-1067263764>. I'm working on a fix.


Repository:
  rG LLVM Github Monorepo

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