atomic.h: Fix build with clang
clang defines __ATOMIC_SEQ_CST but its implementation of the __atomic_exchange() builtin differs from that of gcc. Move the __clang__ branch of the ifdef ladder to the top and fix its implementation (there is no such builtin as __sync_exchange), so we can compile with clang again. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Message-id: 1382435921-18438-1-git-send-email-peter.maydell@linaro.org Signed-off-by: NAnthony Liguori <aliguori@amazon.com>
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