[10] RFR(XS) 8185736: missing default exception handler in calls to rethrow_Stub

[Tom Rodriguez]

http://cr.openjdk.java.net/~never/8185736/webrev
https://bugs.openjdk.java.net/browse/JDK-8185736

C2 exception handler tables must always contain a handler for the bci -1 
since exceptions thrown during exception dispatch will attempt to 
redispatch the recursive exception at bci -1.  C2's rethrow stub may end 
up without a throw to the exit so one must be explicitly inserted to 
ensure the VM doesn't abort during dispatch.  This happened reliably 
because of a StackOverflowException in a Graal system running R code but 
I was unable to build a test case for it.  You can see this missing 
catch_pco by inspecting the -XX:+PrintExceptionHandlers output, so the 
assert by itself show any place where C2 is exposed to this problem.  I 
believe C1 builds it's exception handler tables differently and doesn't 
necessarily include a -1 handler since it always contains an unwind 
handler entry point which is used when no other handler is specified.

Vladimir ran I believe ran this through RBT.

tom