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

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

Change-Id: I420e083196fc4071b00f920166a40b9ffc7bb3af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>