Revert "ART: Add barrier to dex2oat watchdog startup"

This reverts commit 85baf7a5a681c73825e0e0909d3757906b4e772b.

The change was ineffective.

Bug: 63052624
Test: m test-art-host
Change-Id: Id6805e0315feebd2f1afbf41d301074e5518e938
1 file changed