[libcore] Add check that classpath is up to date to getDexOptNeeded

(cherry picked from commit 3b95b7045b8fa57343786a9e4f8405f120ace4cf)

Bug: 62269291
Test: build
Merged-In: Ib5687b628b9dcbf30d1eb0695e0a77ec97dbd66f
Change-Id: Ib5687b628b9dcbf30d1eb0695e0a77ec97dbd66f
1 file changed