gdb: only insert thread-specific breakpoints in the relevant inferiorHEADmaster

This commit updates GDB so that thread or inferior specific
breakpoints are only inserted into the program space in which the
specific thread or inferior is running.

In terms of implementation, getting this basically working is easy
enough, now that a breakpoint's thread or inferior field is setup
prior to GDB looking for locations, we can easily use this information
to find a suitable program_space and pass this to as a filter when
creating the sals.

Or we could if breakpoint_ops::create_sals_from_location_spec allowed
us to pass in a filter program_space.

So, this commit extends breakpoint_ops::create_sals_from_location_spec
to take a program_space argument, and uses this to filter the set of
returned sals.  This accounts for about half the change in this patch.

The second set of changes starts from breakpoint_set_thread and
breakpoint_set_inferior, this is called when the thread or inferior
for a breakpoint changes, e.g. from the Python API.

Previously this call would never result in the locations of a
breakpoint changing, after all, locations were inserted in every
program space, and we just use the thread or inferior variable to
decide when we should stop.  Now though, changing a breakpoint's
thread or inferior can mean we need to figure out a new set of
breakpoint locations.

To support this I've added a new breakpoint_re_set_one function, which
is like breakpoint_re_set, but takes a single breakpoint, and just
updates the locations for that one breakpoint.  We only need to call
this function if the program_space in which a breakpoint's thread (or
inferior) is running actually changes.  If the program_space does
change then we call the new breakpoint_re_set_one function passing in
the program_space which should be used to filter the new locations (or
nullptr to indicate we should set locations in all program spaces).
This filter program_space needs to propagate down to all the re_set
methods, this accounts for the remaining half of the changes in this
patch.

There were a couple of existing tests that created thread or inferior
specific breakpoints and then checked the 'info breakpoints' output,
these needed updating.  These were:

  gdb.mi/user-selected-context-sync.exp
  gdb.multi/bp-thread-specific.exp
  gdb.multi/multi-target-continue.exp
  gdb.multi/multi-target-ping-pong-next.exp
  gdb.multi/tids.exp
  gdb.mi/new-ui-bp-deleted.exp
  gdb.multi/inferior-specific-bp.exp
  gdb.multi/pending-bp-del-inferior.exp

I've also added some additional tests to:

  gdb.multi/pending-bp.exp

I've updated the documentation and added a NEWS entry.

Reviewed-By: Eli Zaretskii <eliz@gnu.org>

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