Disable 1339-dead-reference-safe when debuggable

We keep dead references around in debuggable builds, and the test
doesn't tolerate that.

Test: art/test/testrunner/testrunner.py -j70 --host --64 --debuggable
Change-Id: I1f2d7ad87a337d1f13ee80fd16892280cfe987b9
1 file changed