[clang] [llvm] WebAssembly: Introduce ExceptionHandling::EmscriptenEH model (PR #221443)

[Heejin Ahn via cfe-commits]

================
@@ -195,7 +195,9 @@ codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
           clEnumValN(ExceptionHandling::WinEH, "wineh",
                      "Windows exception model"),
           clEnumValN(ExceptionHandling::Wasm, "wasm",
-                     "WebAssembly exception handling")));
+                     "WebAssembly exception handling"),
+          clEnumValN(ExceptionHandling::EmscriptenEH, "emscripten",
+                     "Emscripten JavaScript-based C++ exception handling")));
----------------
aheejin wrote:

```suggestion
          clEnumValN(ExceptionHandling::Emscripten, "emscripten",
                     "Emscripten JavaScript-based exception handling")));
```

https://github.com/llvm/llvm-project/pull/221443