[clang] [llvm] [WebAssembly] Implement an alternative translation for -wasm-enable-sjlj (PR #84137)

[YAMAMOTO Takashi via cfe-commits]

yamt wrote:

> If possible, can you not force-push? It's hard to track changes between commits with force-pushes. Thank you!

i had to rebase for some unrelated reasons. i will avoid it next time.


https://github.com/llvm/llvm-project/pull/84137