Revert^2 "Pass boot class path to ImageSpace::LoadBootImage."

This reverts commit db4b1dee.

Fixed JDWP tests, see "Test:" stanzas below.

Change-Id: I6fb56ac990b78164cbd3f93c9f6df66e0dd9a813
Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: Pixel 2 XL boots.
Test: m test-art-target-gtest
Test: testrunner.py --target --optimizing
Test: run-libcore-tests.sh --mode=device --variant=X64
Test: run-jdwp-tests.sh --mode=host --variant=X64
Test: run-jdwp-tests.sh --mode=device --variant=X64
Bug: 119868597