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We need a way to determine how an operation on a range which
may overlap with a region intersects. The kernel will notify for
ranges of memory which may span several regions or even be a portion
of a region. This new helper determines how they overlap and returns
the pieces that remain along with the intersection.

Bug: chromium:1067833
Change-Id: I83ab545ec6176105047762e9ba0d7af208255553
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453796Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Brian Geffon <bgeffon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814887}