[llvm] [WebAssembly] Reapply "[WebAssembly] Incorporate SCCs into WebAssemblyFixIrreducibleControlFlow" (#181755) (PR #184441)

[Demetrius Kanios via llvm-commits]

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QuantumSegfault wrote:

I was looking for that! I saw the one operating on normal IR basic blocks, but thought we'd have to roll our own for MBB.

In that case I can just have that run right before this one (I doesn't seem like other passes have had a problem with unreachable blocks...and that we can guard ourselves against all possible passes that run before us).

But yeah, let's see what the others think.

https://github.com/llvm/llvm-project/pull/184441