Revert "Remove VMRuntime.concurrentGC"

This reverts commit 9de9f0d95b3ff48c82a20056c3ab707a24055333.

Reason for revert: 1626960 reverted due to jank

Change-Id: I07265d9fe42d545027bd0aec1a8a77f56d8e65d3
1 file changed