RFR(S): 8131054: aix: fix two minor issues: large page size and hs_err printing.

[Lindenmaier, Goetz]

Hi,

this small change fixes two issues on aix:
- _large_page_size was set to -1 which made TestLargePageUseForAuxMemory fail.
- CPU info was printed twice to hs_err file.

Please review this change.
http://cr.openjdk.java.net/~goetz/webrevs/8131054-aixMinor/webrev/

Best regards,
  Goetz.