RFR(T): 8223427: [TESTBUG] Disable JTReg Shenandoah tests when Graal is enabled

[Aleksey Shipilev]

On 5/8/19 12:15 PM, Pengfei Li (Arm Technology China) wrote:
> Could anyone help review this patch (tiny change on 75 test files)?
> 
> Webrev: http://cr.openjdk.java.net/~pli/rfr/8223427/webrev.00/
> JBS: https://bugs.openjdk.java.net/browse/JDK-8223427

Looks good.

We already have a few tests that do "@requires vm.gc.Shenandoah & !vm.graal.enabled".

-Aleksey