dtrace: add support for sparc64 3of3

dtrace: add support for sparc64 3of3

This commit is the 3rd of 3 commits to add DTrace support to the sparc64
kernel.  This particular commit covers the DTrace implementation code
changes.  It provides an implementation of the DTrace core for sparc64,
SDT, and syscall tracing.

Note that the sparc64 implementation for SDT probe points utilizes a call
to a trampoline function that in turn calls dtrace_probe() rather than
using a trap-based mechanism.  This requires an additional data item to be
associated with each module.  In order to facilitate this in a manner that
is arch-dependent, DTrace specific data other than the list of SDT probes
has been moved to a structure that is maintained by the DTrace module code
and the module struct merely has a generic void *pdata member that can be
populated with a pointer to the actual data.  This commit renames the
num_dtrace_probes member of the module struct to be sdt_probec, since that
is more consistent.

Orabug: 19005031

Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Acked-by: Nick Alcock <nick.alcock@oracle.com>