RFR (S) 8252695: Shenandoah: clean up Graal enabled/disabled filter in tests

[Aleksey Shipilev]

On 9/2/20 9:47 AM, Aleksey Shipilev wrote:
> Testbug RFE:
>     https://bugs.openjdk.java.net/browse/JDK-8252695
> 
> In gc/shenandoah jtreg tests, there are !vm.graal.enabled clauses in some @requires, but not in the
> other. Since JDK 15 and JDK-8249000, we don't need the explicit Graal check in those tests.
> 
> But, for consistency within the tests and consistency across the JDK releases, we might consider
> checking for Graal explicitly. This would enable us to transplant the tests from 15u to 11u without
> remembering to check for Graal additionally.
> 
> Fix:
>     https://cr.openjdk.java.net/~shade/8252695/webrev.01/

...or we can do the reverse, and drop the Graal checks (thus relying on JDK-8249000):
   https://cr.openjdk.java.net/~shade/8252695/webrev.02/

This would complicate 11u porting story, but not significantly so, with the upside of not holding 
jdk/jdk tests back because of 11u.

Tell me what you prefer.

-- 
Thanks,
-Aleksey