[compiler-rt] [libcxx] [libcxxabi] [libunwind] [libunwind][libcxx][libcxxabi][compiler-rt-builtins] Fix Exception Handling build for wasm (PR #79667)

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https://github.com/EricWF requested changes to this pull request.

I think there are some pretty non-idiomatic workarounds for WASM here. I think in general this approach could use a more structured approach to handling where WASM differs.

Also, I know we have the mandatory code-formatter now, but a lot of this diff is just formatting noise. Could we find a way to extract that out?

https://github.com/llvm/llvm-project/pull/79667