Revert "Disable tests causing random failures with Enso and read barriers."

CL 827405 should fix the flaky failures.

Bug: 25838574
Bug: 12687968

This reverts commit 97290796b06fb49b88efee8b992b9b7defa53d00.

Change-Id: I7e8213eb2c8d6489051e187f6f36204be072d738
1 file changed