8307495: Specialize atomic bitset functions for aix-ppc

[dbriemann]

Also refactor so that linux and aix use the same code for ppc.

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Progress

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Error

 ⚠️ Found copyright format issue for oracle in [src/hotspot/cpu/ppc/orderAccess_ppc.hpp]

Issue

• JDK-8307495: Specialize atomic bitset functions for aix-ppc (Enhancement - P4)

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