RFR: 8214484: ZGC: Exclude SA tests ClhsdbJhisto and TestHeapDumpFor*

[Per Liden]

On 11/29/18 4:17 PM, Aleksey Shipilev wrote:
> On 11/29/18 4:07 PM, Per Liden wrote:
>> There's no support for SA heap walking when using ZGC. Hence the tests for this should not execute
>> when ZGC is enabled.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8214484
>> Webrev: http://cr.openjdk.java.net/~pliden/8214484/webrev.0
> 
> Looks good.
> 
> Stylistic: why not "!vm.gc.Z"?

That has a slightly different meaning. vm.gc.Z will be true if 
-XX:+UseZGC is an "acceptable" option. For example, ZGC is supported by 
the build and no other GC was explicitly chosen. vm.gc will be "Z" if 
the test was explicitly executed with -XX:+UseZGC.

So if we used !vm.gc.Z on a build with ZGC support, then the test would 
never execute, unless you also explicitly specified what GC to use.

Yeah, I it's messy... I hope I got the details right there... ;)

cheers,
Per