Use LWSYNC in place of SYNC/ISYNC in PPC spinlocks, where possible.
This is allegedly a win, at least on some PPC implementations, according to the PPC ISA documents. However, as with LWARX hints, some PPC platforms give an illegal-instruction failure. Use the same trick as before of assuming that PPC64 platforms will accept it; we might need to refine that based on experience, but there are other projects doing likewise according to google. I did not add an assembler compatibility test because LWSYNC has been around much longer than hint bits, and it seems unlikely that any toolchains currently in use don't recognize it.
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