ART: Silence some run-test configurations

Run-tests running with a failing dex2oat or patchoat are expected
to print error lines of the failure. In this case set the log-level
to FATAL-only, as stripping those errors is overly complicated.

Bug: 18713034
Change-Id: If9c5f50b517b5e906dd0be841ebc1e7987cac928
1 file changed