[13] RFR(xs) 8226462: [TESTBUG] runtime/appcds/sharedStrings/SysDictCrash.java failed with Cannot dump shared archive

[Calvin Cheung]

bug: https://bugs.openjdk.java.net/browse/JDK-8226462

webrev: http://cr.openjdk.java.net/~ccheung/8226462/webrev.00/

On a test host with large amount of RAM, the UseCompressedOops and the 
UseCompressedClassPointers flags would be disabled ergonomically by the 
VM with the MaxRAMPercentage set to 12.5. To void the test failure, the 
test has been changed to check the given MaxRAMPercentage and uses it if 
the setting is <= 12.5.

Ran the test 20 times on the linux test host where the failure was 
reproduced.

thanks,
Calvin