RFR(M): 8028767: PPC64: (part 121): smaller shared changes needed to build C2

[Lindenmaier, Goetz]

Hi,

This change contains a row of smaller shared changes required to build the C2 compiler on PPC64.
http://cr.openjdk.java.net/~goetz/webrevs/8028767-0-basic/

- fixes for aix build
- make some methods public we need to call
- use RegL for Vectors
- some new utility methods

Please review and test this change.

Best regards,
  Goetz.
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