Add Octeon coprocessor 2 instructions.

No objection from kettenis@

Add Octeon specific sync opcodes.

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

OK jasper@, visa@

make this compile by adapting loongson changes to the 2.17 struct layout
ok miod@ matthew@

A first attempt at merging our local changes and fixes into the 2.17 codebase.
ld(1) needs a lot more work, as the upstream code evolved significantly since
2.15, mostly due to changes in PIE binarie

A first attempt at merging our local changes and fixes into the 2.17 codebase.
ld(1) needs a lot more work, as the upstream code evolved significantly since
2.15, mostly due to changes in PIE binaries layout, and we had already
diverged significantly to implement W^X.

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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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