RFR (S): 8028470: PPC64 (part 214): linux: extend signal handler to catch SIGTRAP on ppc64.

[Lindenmaier, Goetz]

Hi,

PPC has a compare-and-trap instruction that is used for NullChecks and RangeChecks.
If a check fails, SIGTRAP is raised and must be handled by the signal handler of the VM.
Add support for handling SIGTRAP on PPC64 to linux.

http://cr.openjdk.java.net/~goetz/webrevs/8028470-0-trap/

Please review and test this change.

Best regards,
  Goetz.
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