RFR: Make all Shenandoah tests @requires vm.gc.Shenandoah

[Roman Kennke]

> On 11/28/18 12:34 PM, Roman Kennke wrote:
>> This puts @requires vm.gc.Shenandoah tag in all Shenandoah tests under
>> gc/shenandoah such that they don't accidentally get selected in
>> non-Shenandoah builds.
>>
>> Testing: build with --with-jvm-features=-shenandoah,
>> run-tests=gc/shenandoah, get:
>>
>>
>> Test selection 'gc/shenandoah', will run:
>> * jtreg:test/hotspot/jtreg/gc/shenandoah
>>
>> Running test 'jtreg:test/hotspot/jtreg/gc/shenandoah'
>> Test results: no tests selected
>>
>>
>> http://cr.openjdk.java.net/~rkennke/tests-req-shenandoah/webrev.00/
> 
> Hold on, let me add "@key gc" and make sure "@test" is correct, and format test blocks consistently
> then. Apply on top of your patch:
>   http://cr.openjdk.java.net/~shade/shenandoah/shade-tests-updates.patch
> 
> New synopsis: "Shenandoah should @require Shenandoah, @key gc, and have good @test"
> 
> tier3_gc_shenandoah seems unaffected.

Great! Thanks! I pushed it with your patch and changed synopsis.

Roman