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

[Heejin Ahn via cfe-commits]

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@@ -386,6 +386,20 @@ void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
       // Backend needs '-exception-model=wasm' to use Wasm EH instructions
       CC1Args.push_back("-exception-model=wasm");
     }
+
+    if (Opt.starts_with("-experimental-wasm-enable-alt-sjlj")) {
+      // '-mllvm -experimental-wasm-enable-alt-sjlj'  should be used with
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aheejin wrote:

```suggestion
      // '-mllvm -experimental-wasm-enable-alt-sjlj' should be used with
```

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