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126.96.36.199: ppc: Implement compare-and-swap-vops.
* Based roughly on the x86-64 version and the differences between x86oid define-full-reffer and the PPC use of VOPs instead (the VOPs seem smart enough, why do x86oids do the whole define-full-reffer / -c VOP thing?). * Compare-and-swap VOPs are full memory barriers. * Left the VOPs conditionally-compiled in based on the compare-and-swap-vops feature, more as documentation of what is involved than anything else. * Enabled compare-and-swap-vops for all PPC targets.
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