tree b3e06c7f947f0354a5f619e8edbf75a78907d245
parent 45a3eb41aa536002306af7ff1d52647e9af22855
author Scott Todd <scotttodd@google.com> 1686594693 -0700
committer GitHub <noreply@github.com> 1686594693 -0700
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[WebGPU] Async, loop-based invoke and output. (#13962)

Redo of https://github.com/openxla/iree/pull/13820, which was closed
because GitHub is silly.

---

Now that https://github.com/openxla/iree/pull/13669 added support for
`iree_loop_wait_all()` to `iree_loop_emscripten`, this builds on the
work that https://github.com/openxla/iree/pull/11017 started to convert
the sample WebGPU application to be fully asynchronous[1].

The code _should_ support multiple return values, but I ran into
https://github.com/openxla/iree/issues/13809 while working on this.

^[1]: `iree_hal_semaphore_wait` is still technically synchronous, see
the notes in the source code