WebAssembly: Take the exception model from the module flag (#227583) The WebAssembly EH passes chose whether and how to run from MCAsmInfo::getExceptionHandlingType() and TargetOptions::ExceptionModel. A module that asked for Wasm EH through the module flag alone would have its invokes rewritten by LowerInvoke before WasmEHPrepare ran. Schedule the passes unconditionally and read the module flag inside them instead. WebAssemblyLowerEmscriptenEHSjLj now lowers invokes itself when neither Wasm nor Emscripten EH is in use, replacing the separately scheduled LowerInvoke and UnreachableBlockElim. addPassesToHandleExceptions becomes virtual so WebAssembly can always schedule WinEHPrepare and WasmEHPrepare, which do nothing without Wasm EH. Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
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