RFR: 8231954: [TESTBUG] Test compiler/codegen/TestCharVect2.java only works with server VMs.

[christoph.goettschkes at microdoc.com]

Hi,

The test "compiler/codegen/TestCharVect2.java" uses the VM flag 
"MaxVectorSize" which is not defined for all supported VM configurations. 
Client VMs exit with an "Unrecognized VM option" error.

Bug: https://bugs.openjdk.java.net/browse/JDK-8231954
Webrev: https://cr.openjdk.java.net/~bulasevich/8231954/webrev.00

Igor suggested to use the tag '@requires vm.flavor == "server"', but since 
other tests like [1] and [2] are also using my suggested approach, and I 
am uncertain how the flag MaxVectorSize plays together with the JVMCI, I 
would currently stick with my approach and would like to get more feedback 
on this topic. Also, the @requires tag would disable the test altogether, 
but the first run (without the MaxVectorSize option) works in client VMs 
and might be a viable test case, which is lost if the tag is added.

Thanks,
Christoph

[1] 
https://hg.openjdk.java.net/jdk/jdk/file/4dbdb7a8fa75/test/hotspot/jtreg/compiler/vectorization/TestNaNVector.java
[2] 
https://hg.openjdk.java.net/jdk/jdk/file/4dbdb7a8fa75/test/hotspot/jtreg/compiler/vectorization/TestPopCountVector.java