run-libcore-tests.sh: add timeout for host + debug + gcstress

Bug: 161420453
Test: run-libcore-tests.sh --mode=host --vm-arg -Xgc:gcstress \
        -- org.apache.harmony.tests.java.text.DateFormatTest
Test: run-libcore-tests.sh --mode=host --debug --vm-arg -Xgc:gcstress \
        -- org.apache.harmony.tests.java.text.DateFormatTest
Change-Id: I1f2aebc00944802e805297bea7af5501f83791df
1 file changed