RFR(T) : 8243944 : use SkippedException and @requires in runtime/memory/ReadFromNoaccessArea.java test

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8243944/webrev.01
> 8 lines changed: 2 ins; 5 del; 1 mod; 

HI all,

could you please review this trivial patch?
from JBS:
> runtime/memory/ReadFromNoaccessArea.java test can be run only on 64 bits platform and currently exits if it's not the case; this test also doesn't conduct any verification if a forked JVM prints 'WB_ReadFromNoaccessArea method is useless' so SkippedException can be used to signal that the test wasn't really performed.

JBS: https://bugs.openjdk.java.net/browse/JDK-8243944
webrev: http://cr.openjdk.java.net/~iignatyev//8243944/webrev.01
testing: runtime/memory/ReadFromNoaccessArea.java 

Thanks,
-- Igor