Re-enable wasm32 tests in CI

[Mark-Simulacrum]

These were previously disabled but the relevant fix in Cargo has
long since landed. The wasm32 builder is hovering at around 35
minutes right now, so we have capacity to do this.

r? @alexcrichton

[alexcrichton]

@bors: r+

[bors]

📌 Commit 2c0e1be has been approved by alexcrichton

[Mark-Simulacrum]

@bors rollup=iffy

Seems not unlikely to fail in some test or another.

[bors]

⌛ Testing commit 2c0e1be with merge 6c0bdf5a7b522df238774cd24dbbc1b2d1466edc...

[bors]

💔 Test failed - checks-actions

[Mark-Simulacrum]

Hm the undefined symbol appears to be core::array::<impl core__convert__AsMut<[T]> for [T; N]>::as_mut (demangled), but AFAICT there's nothing wasm-specific about that function or impl. Any ideas? Perhaps we've seen similar before?

[alexcrichton]

Doesn't look like anything I'm familiar with at least, but I'm also more familiar with wasi than emscripten.

[Mark-Simulacrum]

Okay I'm going to give this a close and open up an issue as I don't really know how to make progress in that case (nor do I have the time to debug this right now).