6682020: (bf) Support monitoring of direct and mapped buffer usage

[Alan Bateman]

Iris - can you review 6682020? This adds instrumentation so that the 
resources for direct and mapped buffers can be monitored by jconsole and 
other JMX based tools. It builds on the generic support that Mandy added 
last week [1].

Thanks,
-Alan

[1] http://hg.openjdk.java.net/jdk7/tl/jdk/rev/fd563c5dd750
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