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This commit adds GCC-compatible atomic builtins to stdatomic.h for
better compatibility with code relying on GCC's atomic primitives.
1. **New Macros**:
- `__atomic_compare_exchange_n`.
- `__atomic_load_n`.
- `__atomic_store_n`.
2. **Motivation**:
- Improves compatibility with codebases using GCC's atomic builtins
directly.
- Simplifies atomic operations by allowing direct value passing
(instead of pointers), enhancing code readability.
- Aligns TCC's atomic support closer to GCC/Clang for cross-compiler
projects.
3. **Testing**:
- Verified with basic test cases (integer CAS, load/store) on x86.
- Confirmed no regressions in existing atomic operations.
- This change does not affect existing C11 `atomic_*` APIs.
- Struct types are intentionally unsupported in `_n` variants due to
complexity.
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All atomic tests passed!
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