RFR (M): 8031319: PPC64: Some fixes in ppc and aix coding.

[Lindenmaier, Goetz]

Hi,

This change contains a row of fixes in the ppc and aix coding
we collected over the last testing days.
Please review this change.
http://cr.openjdk.java.net/~goetz/webrevs/8031319-ppcFix/

In more detail:

Stack overflow issue: code branched to zero.
Fix: Generate throw_StackOverflowError stub before generating
the native entry.

Fix assertion when looking for nmethod in code cache:
use unsafe accessor. Also optimize: don't look up the
address twice.

Fix compressing klass pointers.

Implement some missing stuff in the aix os branch.

Thanks and best regards,
  Goetz.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/attachments/20140107/d685cb63/attachment-0001.html