bug fix: Floating point native code argument marshalling & debug build errors

[Joseph Joyce]

Hi all,
I've linked a webrev that contains fixes for:

Build errors when building a debug build due to incorrectly named
variables used in assertions.

Floating point variables being placed only into even (double) floating
point registers, this results in italic fonts in awt/swing
applications.

http://cr.openjdk.java.net/~jjoyce/0/

Thanks
Joseph