RFR(L) 8159976: PPC64: Add missing intrinsics for sub-word atomics

[Doerr, Martin]

Hi,

after JDK-8157726 was pushed, the JVM supports intrinsics for sub-word atomics.

I have adapted the PPC64 implementation:
http://cr.openjdk.java.net/~mdoerr/8159976_PPC64_subword_atomics/webrev.00/

The change also removes old String intrinsics which are no longer needed (since the new ones are available).

Please review.

Best regards,
Martin

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