RFR: 8221397 Support implementation-defined Map Modes

[Andrew Dinn]

Could I please have reviews for the following enhancement:

JIRA:   https://bugs.openjdk.java.net/browse/JDK-8221397
webrev: http://cr.openjdk.java.net/~adinn/8221397/webrev.00/

Testing
tier1 tests passed locally
Submit job completed without error

regards,


Andrew Dinn
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Senior Principal Software Engineer
Red Hat UK Ltd
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