RFR(M): 8144466: ppc64: fix argument passing through opto stubs.

[Lindenmaier, Goetz]

Hi,

I need to fix the calls to runtime for ppc because it expects int
being properly sign extended to long.
In 8086069, we tried to push this to the platform code, but for
opto stubs this is not possible.

Please review this change. I please need a sponsor.
http://cr.openjdk.java.net/~goetz/webrevs/8144466-ppcOptoStubs/webrev.00/

The change comes with a corresponding test.
I also added a test for a problem we fixed before, where
floating point args were passed wrong.

Best regards,
  Goetz.


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