b65544a68c
emitAtomicRmw xchg arm (swap) and emitAtomicFence (LLVMBuildFence) now real. examples/1703 (swap old=7/now=42, 'atomicrmw xchg') + 1704 (fence release/acquire/ seq_cst) green. Unit test 'emit: atomic swap (xchg) + fence'. Stream A (atomics) is feature-complete: load/store, RMW (add/sub/and/or/xor/min/max), compare_exchange[_weak], swap, fence. Suite green (721/0).
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