rdar://105692614 Currently, the new BBQ baseline JIT for WebAssembly only supports throwing a few niche exceptions, for traps like unreachable instructions or dividing by zero. We need to implement the full WASM exception handling extension (https://github.com/WebAssembly/exception-handling/blob/main/proposals/exception-handling/Exceptions.md) for parity with the existing Air backend. Specifically, this entails implementing the following instructions: - `try` - `catch` - `catch_all` - `throw` - `rethrow` - `delegate`