[11u] RFR: 8208655: use JTreg skipped status in hotspot tests

[Langer, Christoph]

Hi,

as was discussed previously, it seems to be useful for backporting new tests and test fixes to make jtreg.SkippedException available in JDK11 updates. Hence, please review this backport of JDK-8208655 [1].

Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8208655.11u-dev.0/

Firstly, the change did not apply exactly cleanly. I had to make modifications to test/hotspot/jtreg/runtime/CompressedOops/CompressedClassPointers.java.

Then, I also modified the following 3 tests which already contain backports to 11u during which SkippedException was removed. So I added back SkippedException there - making the tests resemble what they currently look like in jdk/jdk:
test/hotspot/jtreg/compiler/codegen/aes/TestAESMain.java
test/hotspot/jtreg/compiler/codegen/aes/TestCipherBlockChainingEncrypt.java
test/hotspot/jtreg/compiler/intrinsics/base64/TestBase64.java

As the original change of 8208655 wasn't perfect and would cause a few test failures if applied alone, I'll also have to bring in JDK-8208701 [2] and JDK-8208706 [3]. So, once pushing this, I'll push all of these 3 items.

@Severin<mailto:sgehwolf at redhat.com>: you already got reviews for backports of 8220672 and 8221710 where you replaced SkippedException. Those aren't pushed yet. So, I'd like to ask you whether you could hold off pushing until 8208655 is in and then go for SkippedException. Maybe the fixes even apply cleanly then?

Thanks
Christoph

[1] https://bugs.openjdk.java.net/browse/JDK-8208655
[2] https://bugs.openjdk.java.net/browse/JDK-8208701
[3] https://bugs.openjdk.java.net/browse/JDK-8208706