RFR(M): 8042309: Some bugfixes for the ppc64 port.

[Lindenmaier, Goetz]

Hi,

please review this change.  I also please need a sponsor.
It should go to jdk8u20 at some point.  It only touches files
needed for the ppc64 port.
http://cr.openjdk.java.net/~goetz/webrevs/8042309/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8042309

This change fixes a few bugs in the ppc64 port:

* Expand of max/min nodes in .ad file relied on 64-bit sign extend
  but placed the values in 32-bit registers.  After SpillCopies
  the upper bits were lost.
* Expand of decodeNKlass used wrong node.
* Implement missing support for method handles in generate_throw_exception.
* Some small optimizations and cleanups.

Thanks and best regards,
  Goetz.
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