RFR(XS): 8131761: Fix merge error adding code that was removed in 8077936.

[Lindenmaier, Goetz]

Hi,

8077936 http://hg.openjdk.java.net/jdk9/dev/hotspot/rev/e57fce7b6ad2
removed the function obj_field_volatile(). This was added again
in this merge change: http://hg.openjdk.java.net/jdk9/dev/hotspot/rev/5f2ef612ed74.

This change removes it once more.

Please review this change. I please need a sponsor.
http://cr.openjdk.java.net/~goetz/webrevs/8131761-fixMerge/webrev.01/

Best regards,
  Goetz.
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