RFR (trivial) 8209518: symbol table gtest fails with semaphore error

[Kim Barrett]

> On Aug 14, 2018, at 7:56 PM, coleen.phillimore at oracle.com wrote:
> 
> Summary: loop count was wrong.
> 
> Retested with make test-hotspot-gtest
> 
> open webrev at http://cr.openjdk.java.net/~coleenp/8209518.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8209518
> 
> Thanks,
> Coleen

Looks good.