[llvm] [WebAssembly] Add -wasm-use-legacy-eh option (PR #122158)

[Derek Schuff via llvm-commits]

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@@ -250,8 +250,16 @@ Changes to the WebAssembly Backend
   `-mmutable-globals`, `-mcall-indirect-overlong`, `-msign-ext`,
   `-mbulk-memory-opt`, `-mnontrapping-fptoint`, and `-mextended-const`.
 
+* The support for the new standardized [Exception Handling] proposal is added.
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dschuff wrote:

```suggestion
* Support for the new standardized [Exception Handling] proposal is added.
```

https://github.com/llvm/llvm-project/pull/122158