[Bug dyninst/16250] New: Allow triggering remote gdb through stapdyn

["jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16250

            Bug ID: 16250
           Summary: Allow triggering remote gdb through stapdyn
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: dyninst
          Assignee: systemtap at sourceware dot org
          Reporter: jistone at redhat dot com

Like Valgrind's "gdbserver" functionality, it would be nice if a stap script
could trigger gdb on a target process.  I imagine this will be best approached
in stapdyn mode, but maybe it could be considered from the kernel runtime too.

I expect two main tasks required:

1. Create the actual gdbserver / gdb stub.  Since Dyninst already has ptrace
control of its process in libpcontrol.so, this might make the most sense as a
new feature of proccontrol.  This will surely involve the most effort.

2. Create the trigger for scripts, probably just as a tapset function.  It
needs to be a synchronous event which freezes the process until gdb arrives. 
Whether the probe completes first is up for debate.  It only makes sense to be
called from within a target process, not from stapdyn itself in
begin/end/timer/etc.

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