Release startup dex cache arrays in the GC critical section. am: c20133f66a am: 6793c1e54d am: 3d94df5669

Original change: https://android-review.googlesource.com/c/platform/art/+/2300939

Change-Id: Icd2ce2e3aa96cfd72f7aa48b1c1877de0bb8d751
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>