llvm-project

3ffaaf6d - [Xtensa] Implement Xtensa S32C1I Option and atomics lowering. (#137134)

[Xtensa] Implement Xtensa S32C1I Option and atomics lowering. (#137134) Implement Xtensa S32C1I Option. Implement atomic_cmp_swap_32 operation using s32c1i instruction. Use atomic_cmp_swap_32 operation and AtomicExpand pass to implement atomics operations.