Revert "Pass boot class path to ImageSpace::LoadBootImage."
This reverts commit d1908514.
Also squash a revert of
Fix oatdump tests on target.
(commit 77eea089)
Reason for revert: Broke JDWP tests.
Bug: 119868597
Change-Id: I005097d2d96014c961e5a4c0b089e7675004febc