[browser] don't use legacy Wasm Exceptions

[pavelsavara]

See WebKit/JetStream#188 (comment)

(module
  (type $t0 (func))
  (func $f0 (type $t0)
    (try $T0
      (do)
      (catch_all))))

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[maraf]

Based on the original comment it is a jiterp generated module

[pavelsavara]

I think we are using legacy feature detection but should be using new one

[pavelsavara]

It seems we would need emscripten upgrade to at least version 4.0.0 to be able to use -s WASM_LEGACY_EXCEPTIONS=0

Alternatively we could use wasm-opt --experimental-new-eh