RFR(S) : 8206117 : failed to get JDK properties for JVM w/o JVMCI

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8204517/webrev.00/index.html
> 39 lines changed: 0 ins; 0 del; 39 mod; 

Hi all,

could you please review this small fix? if JVM has been build w/o JVMCI, it won't have EnableJVMCI flag, as a result jtreg-ext/requires/VMProps will throw NPE trying to set 'vm.opt.final.EnableJVMC' property. w/ this fix, we will get 'null' value for nonexistent flags. compiler/graalunit/graalunit/generateTests.sh has been updated to generate tests which can handle such values, compiler/graalunit/ tests have been regenerated.

webrev: http://cr.openjdk.java.net/~iignatyev//8204517/webrev.00/index.html
JBS: https://bugs.openjdk.java.net/browse/JDK-8206117
testing:  compiler/graalunit tests on builds w/ and w/o JVMCI

Thanks,
-- Igor