Have JavaFrameRootInfo give more info about provenance of root.

It can be useful to differentiate between java frame roots being the
methods declaring class, from a proxy method, being unknown due to
an imprecise walk or being indeterminable. This passes that
information with the Vreg.

Test: ./test.py --host
Bug: 134162467

Change-Id: I74842d3eeedee5c836511e046652502a53de0f7e
4 files changed