RFR(M): 8020775: PPC64 (part 12): posix signal printing

[Lindenmaier, Goetz]

Hi,

we'd like to contribute our posix signal printing.
We implemented some routines to print signal and sa_flags information
in the os/posix files, and call them from
os::print_siginfo and print_signal_handler() in the various unix
variant directories.
The output is a bit more verbose than the existing version.

We contribute this here, as our aix code uses this too.

Please review this and test it if you think we should add this.
We'd appreciate it.
http://cr.openjdk.java.net/~goetz/webrevs/8020775-print_sig/

Thanks and best regards,
  Goetz.
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