transpile: Support __atomic_thread_fence/__atomic_signal_fence builtins#1862
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A couple inline comments, no blocking concerns.
…iltins Map them to the `atomic_fence`/`atomic_singlethreadfence` intrinsics using the call's memory order. The order must be a constant (a non-constant one fails translation); a relaxed fence is emitted as a no-op since Rust has no relaxed fence intrinsic.
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Needed to land #1861.