Fix double decoration if a binding array contains a struct with a runtime array

[Vecvec]

Connections
Fixes #5755

Description
Previously if a binding array contained a struct with a runtime array it would generate two OpDecorate Blocks which was not allowed by the spirv specification.

Testing
This shader no longer produces two OpDecorate Blocks

struct Array {
    arr: array<u32>,
}

@group(0) @binding(0)
var<storage> store: binding_array<Array>;

and a similar one inside naga's tests (binding-buffer-arrays.spvasm) also no longer produces two OpDecorate Blocks

Checklist

• Run cargo fmt.
• Run cargo clippy. If applicable, add:
  • --target wasm32-unknown-unknown not applicable
  • --target wasm32-unknown-emscripten
• Run cargo xtask test to run tests.
• Add change to CHANGELOG.md. See simple instructions inside file.

[teoxoy]

Thanks!

[kvark]

@teoxoy are we planning to have this fix on crates soon?

[cwfitzgerald]

This will land during the next wgpu release, 0.22, which is scheduled for next Wednesday.