RFR(XS): 8248878: SA: Implement simple workaround for JDK-8248876

[Chris Plummer]

Hello,

Please help review the following:

http://cr.openjdk.java.net/~cjplummer/8248878/webrev.00/index.html
https://bugs.openjdk.java.net/browse/JDK-8248878

The explanation of the fix is in the CR. The parent CR, JDK-8248876 [1], 
explains the issue being addressed.

There's no test for this fix yet. It requires the changes I'm making for 
JDK-8247514 [2], which include changes to "findpc" support and the 
ClhsdbFindPC.java test that trigger this issue.

[1] https://bugs.openjdk.java.net/browse/JDK-8248876
[2] https://bugs.openjdk.java.net/browse/JDK-8247514

thanks,

Chris