Make compiler/debug/ symbols hidden. am: 79c4f832be

Original change: https://android-review.googlesource.com/c/platform/art/+/2303002

Change-Id: I64146d13983d6dc6c9840709760a6f6675141da3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>