Re-enable some run-tests with CC after mterp fix.

These tests might have been affected by a moving GC issue in
the fast interpreter:
- 004-ThreadStress
- 141-class-unload

Re-enable them so that we can monitor them on the concurrent
collector configurations.

Bug: 26786154
Bug: 25866001
Bug: 12687968
Change-Id: I3b4902501ea1d13ef5454974be68b82ee196a169