RFR(XS): JDK-8199559: objArrayKlass::oop_iterate() and friends must use base_raw() instead of base()

[Roman Kennke]

Currently, objArrayKlass::oop_iterate() and related methods use base()
to get the actual starting address of the array. However, base()
resolves the oop via barriers. oop_iterate() is used solely by GC code,
which requires direct access to the array, no matter which copy, and
thus needs to use base_raw() instead.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8199559
Webrev:
http://cr.openjdk.java.net/~rkennke/8199559/webrev.00/

Can I please get a review?

Thanks, Roman

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