[lld] [llvm] [WebAssembly] Require tags for Wasm EH and Wasm SJLJ to be defined by compiler-rt (PR #159143)

[Sam Clegg via llvm-commits]

sbc100 wrote:

@aheejin @dschuff, I wonder what you think of this change.

The emscripten side change is here: https://github.com/emscripten-core/emscripten/pull/25284

Technically I suppose is an ABI break since it will require any new object to be linked against a compiler-rt / libc that contains these tags, but it seems like a very low level internal detail that should be easy for toolchains to update to.

https://github.com/llvm/llvm-project/pull/159143