8242477: (bf) MappedByteBuffer should clarify copying between overlapping mappings

[Brian Burkhalter]

> On Apr 11, 2020, at 4:23 AM, Florian Weimer <fw at deneb.enyo.de> wrote:
> 
> In principle, this also applies to direct buffer created via JNI's
> NewDirectByteBuffer.  Such direct buffers could alias with each other
> or even MappedByteBuffer instances.

Indeed. And in an even simpler case, two different views of the same direct buffer could produce unexpected results with a relative bulk put from one into the other.

Brian
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