RFR: SieveObjects -UseTLAB config timeouts

[Aleksey Shipilev]

http://cr.openjdk.java.net/~shade/shenandoah/tests-sieve-timeout/webrev.01/

SieveObjects -UseTLAB timeouts on most of our servers, increase its timeout.

Testing: hotspot_gc_shenandoah

Thanks,
-Aleksey