[RFR]8215622: Add dump to file support for jmap histo

[臧琳]

Hi All,
       May I ask your help to review this patch for enhance jmap ¨Chisto.
It add the ¡°file=<path>¡± arguments that allow jmap ¨Chisto outputs data to file directly.
This patch is also part of the enhancement described in https://bugs.openjdk.java.net/browse/JDK-8214535.

Webrev: http://cr.openjdk.java.net/~xiaofeya/8215622/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8215622

Thanks.

BRs,
Lin



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