* src/atomic_ops.h: Update comment (add AO_and, AO_xor).

* src/atomic_ops.h: Update comment (add AO_and, AO_xor).
* src/atomic_ops/generalize.h (AO_and_full, AO_xor_full): New functions.
* src/atomic_ops/sysdeps/gcc/x86.h: Ditto.
* src/atomic_ops/sysdeps/gcc/x86_64.h: Ditto.
* src/atomic_ops/sysdeps/generic_pthread.h: Ditto.
* src/atomic_ops/sysdeps/sunc/x86.h: Ditto.
* src/atomic_ops/sysdeps/sunc/x86_64.h: Ditto.
* src/atomic_ops/generalize.h (AO_and_..., AO_xor_..., AO_HAVE_and_...,
AO_HAVE_xor_...): New macros.
* tests/test_atomic.template (test_atomicXX): Fix "or" constant; add AO_xor()
and AO_and() tests.
* tests/test_atomic_include.h: Regenerate.