Regenerate on sdk-1.4.328.1

[MarijnS95]

https://github.com/KhronosGroup/SPIRV-Headers/releases/tag/vulkan-sdk-1.4.321.0

[kvark]

LGTM, but who is generally reviewing rspirv these days?

[MarijnS95]

@kvark I don't know unfortunately 😅 - I've mostly been performing upgrades and fixing random user reports while I didn't really have a use for this crate myself, but it still seems gfx-rs is using it in naga? @msiglreith used to be reviewing my PRs in the past at least :)

[MarijnS95]

Looking at the diff myself, I've yet to add some new OpTypes to the grammar so that we don't end up with an error like #266 later, will do so soon.

[MarijnS95]

It always surprised me that we had to manually add these (and have a lot of bugs like #266 as a result), even though they can be very trivially generated: #269

[MarijnS95]

Following #269 it turns out OpGraphConstantARM isn't actually a constant, but from the Graph class - it might still define a constant though? Needs to be tested, because this will otherwise be removed from the new is_constant(self) function.