Clear mod-union tables for immune spaces in PreZygoteFork am: 157084ac62 am: 2eaf72a47c am: 9dec44d93b

Original change: https://android-review.googlesource.com/c/platform/art/+/2390333

Change-Id: I45ae796a590e3f0cf577b2981c8ffe494ebcda80
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>