WebGPU/WGSL: atomicCompareExchangeWeak now returns structure _atomic_compare_exchange_result<T>

[amaiorano]

Hello,

I'm a developer on the Google Tint team, and I wanted to let you know that we just landed a breaking change to atomicCompareExchangeWeak that will affect you here. Instead of returning a vec2, it now returns a struct, as per the spec. Ideally, we minimize breaking changes like this with deprecation periods, but for builtin return types, this is difficult to do.

Please let me know if this is going to be a major problem for you. If so, perhaps we can work out a compile-time flag to bring back the old code path, if really necessary.

Calling out @qjia7 on this issue as per @kainino0x.

[qjia7]

Thanks for the reporting. I think we can release a new npm package with the fixing in #6484. So it's ok for TFJS without the old code path in tint.

[qjia7]

cc @mattsoulanille webgpu backend needs a new npm release so that it can work with latest chrome canary, thanks.