[9] RFR(XS): 8165050: [jittester] generated tests cannot be run with jtreg

[Tatiana Pivovarova]

Hello!

Please review this small patch

Bug:
After moving jdk.test.lib and next fixing of jittester building 
(8164648) JTREG cannot find jdk.test.lib library to compile generated test
Fix:
After considering several approaches we decided to return the previous 
approach - just copy jdk.test.lib in $TESTBASE folder

Tested locally

bug: https://bugs.openjdk.java.net/browse/JDK-8165050
webrev: http://cr.openjdk.java.net/~tpivovarova/8165050/webrev.00/

Thanks,
Tatiana