std: Enable atomic.fence emission on wasm32
This commit removes the `#[cfg]` guards in `atomic::fence` on wasm targets. Since these guards were originally added the upstream wasm specification for threads gained an `atomic.fence` instruction, so LLVM no longer panics on these intrinsics. Although there aren't a ton of tests in-repo for this right now I've tested locally and all of these fences generate `atomic.fence` instructions in wasm. Closes #72997
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