Merge "Determine whether to enable userfaultfd GC at build time." am: 09207360

Original change: https://android-review.googlesource.com/c/platform/build/+/2304232



Change-Id: I309d6877894a3b37284d5f49b69c7b258614563e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>