Avoid inopportune GC with explicit gc() call am: eb6713fe53 am: 7ac941f092

Original change: https://android-review.googlesource.com/c/platform/art/+/2107020

Change-Id: Ifc944df9b385ff6574c28a545962abd31e6ff941
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>