RFR (S): 7129724: Fix location of core file in dump message on macosx

[Vladimir Kozlov]

Looks good to me.

Vladimir

Mikael Vidstedt wrote:
> 
> If HotSpot crashes the dump message prints the default location of the 
> generated core file. On other "posix" like OSes the path is normally 
> <cwd>/core or core.<pid>, but on macosx the cores always end up in 
> /cores/core.<pid>. This change aims to reflect that. Verified manually 
> on Linux and macosx. Passes JPRT.
> 
> Webrev: http://cr.openjdk.java.net/~mikael/7129724/webrev.00
> 
> Cheers,
> Mikael
>