Faster BCP checksum verification.

Avoid opening dex files for updatable BCP components.
Just collect the checksums from jar files using the
`DexFileLoader::GetMultiDexChecksums()` API.

(cherry picked from commit e020b7f4afc4d99cddfd52b3587280be9e3afd5d)

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 191828947
Merged-In: Ib737fabc832c56bffef8a98382f689aabe588bd2
Change-Id: I23b6adc30c57182c56c713da94a77fe65c15bb45
1 file changed