Add Octeon specific sync opcodes.

This is needed for proper sili(4) functionality on Octeon II machines.

OK jasper@, visa@

Here comes the easter bunnytils 2.17 (the last version released against a
licence mere mortals can understand the terms of); will be connected to the
build on an arch-by-arch basis.

Testsuites and g

Here comes the easter bunnytils 2.17 (the last version released against a
licence mere mortals can understand the terms of); will be connected to the
build on an arch-by-arch basis.

Testsuites and generated files have been intentionnaly omitted from this import.

Peer pressure and ok from at least drahn@ pirofti@ deraadt@

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