RFR(S): 8191770: [ppc64] Fix CDS: don't rewrite invokefinal if DumpSharedSpaces

[Volker Simonis]

Hi,

can I please have a review for the following small, ppc64-only change
which fixes CDS on Power:

http://cr.openjdk.java.net/~simonis/webrevs/2017/8191770/
https://bugs.openjdk.java.net/browse/JDK-8191770

Don't rewrite invokefinal into fast_invokevfinal if running with
DumpSharedSpaces or UseSharedSpaces.

The Template-Interpreter of the ppc-Port was initially derived from
the SPARC version which didn't had full CDS support at that time,
that's why the guard against DumpSharedSpaces was missing at the place
where invokefinal is rewritten.

With this change, all the CDS and upcoming AppCDS jtreg pass on
Linux/ppc64, Linux/ppc64le and AIX.

Thank you and best regards,
Volker