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

[Demetrius Kanios via llvm-commits]

QuantumSegfault wrote:

@dschuff 

You still "Approve"? I rechecked against Emscripten `core0`, `core3`, `cores`, and `other` (and CI has handled LLVM/Clang, now including our reproducer), and it's all good.

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