[naga] [msl-out] Add support for metal's atomic_compare_exchange_weak #5675
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Fixes wgpu/wgpu#5257 and wgpu/wgpu#4364
Description
Adds an implementation of
naga::Statement::Atomic {fun: naga::AtomicFunction::Exchange { compare: Some(expr) } }to the msl-out backend.Testing
Passes tests given by
cargo xtask validate mslin filenaga/tests/out/msl/atomicCompareExchange.mslChecklist
cargo fmt.cargo clippy. If applicable, add:--target wasm32-unknown-unknown--target wasm32-unknown-emscriptencargo xtask testto run tests.CHANGELOG.md. See simple instructions inside file.