RFR (S) 8144940: Broken hash in string table entry in closed/runtime/7158800/BadUtf8.java

[Coleen Phillimore]

Summary: Fix code broken with compact Strings.

One of the failure modes of an intermittent bug (but this failure is not 
intermittent).

Tested with the failing test cases that exercise this code. Also, 
testing in order to find linked bugs.

open webrev at http://cr.openjdk.java.net/~coleenp/8144940.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8144940

Thanks,
Coleen