e5586f61b8
LLVM rejects a sub-byte atomic memory access (must be byte-sized), so Atomic(bool) — bool lowers to i1 — failed verification on load/store. The atomic emitters in src/backend/llvm/ops.zig now perform a sub-byte access in its byte storage type (i8) and trunc/zext the value at the boundary (new atomicByteType helper: i8 for .bool, null otherwise). rmw/cmpxchg are left as-is on purpose — a bool rmw/CAS is rejected at the sx level (integer-only), so a sub-byte element never reaches those emitters. Regression test examples/1705-atomics-bool-byte-promoted.sx. Suite green 729/0. Unblocks Future.canceled: Atomic(bool) in the B1.2 async layer.
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