RFR(xs): 8224548: [TESTBUG] runtime/appcds/jvmti/ClassFileLoadHookTest.java failed: must be shared

[Calvin Cheung]

bug: https://bugs.openjdk.java.net/browse/JDK-8224548
webrev: http://cr.openjdk.java.net/~ccheung/8224548/webrev.00/

I couldn't reproduce the failure so far. The failure is likely due to 
mapping of the shared archive failed on Windows occasionally.
For the -Xshare:auto case, check if the app class is loaded from the 
archive only if the java/lang/Object class is loaded from the archive.

Testing: ran the test on a Windows host repeated 60 times.

thanks,
Calvin