[libcxxabi] [libunwind] [llvm] [WebAssembly] Directly call EH personality function (PR #175202)

[Demetrius Kanios via cfe-commits]

QuantumSegfault wrote:

So what I'm saying is

```define void @catch() personality ptr @__gxx_wasm_personality_v0 {```

Should actually emit a call to a symbol named `__gxx_wasm_personality_v0`. Not a hard-coded `_Unwind_CallPersonality`.

But `__gxx_wasm_personality_v0` would then be expected to act exactly as `_Unwind_CallPersonality`.

https://github.com/llvm/llvm-project/pull/175202