hg: jdk9/hs-comp/hotspot: 8069030: support new PTRACE_GETREGSET

[dean.long at oracle.com]

Changeset: 5960a65b0f54
Author:    dlong
Date:      2015-02-02 23:26 -0500
URL:       http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/5960a65b0f54

8069030: support new PTRACE_GETREGSET
Summary: use PTRACE_GETREGSET if other options are not available
Reviewed-by: sla, dholmes

! agent/src/os/linux/ps_proc.c