[7/9] simplify pending breakpoints

[Vladimir Prus]

This patch makes breakpoint_re_set_one handle pending
breakpoints and eliminates resolve_pending_breakpoints.
As a side effect, when a pending breakpoint is resolved,
it no longer changes number. The real purpose of this
patch is that with multiple breakpoints, breakpoint_re_set_one
gets to update the set of locations of a breakpoint, and this
will automatically handle pending breakpoints anyway. OK?

- Volodya

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	gdb/
	* breakpoint.c (do_restore_lang_radix_cleanup): Remove.
	(resolve_pending_breakpoint): Remove.
	(re_enable_breakpoints_in_shlibs): Remove.
	(unlink_locations_from_global_list): New.
	(update_breakpoint_locations): New.
	(breakpoint_re_set_one): Don't bail out on pending breakpoints.
	Use parse_condition and update_breakpoint_location to
	reset breakpoint.  Ignore 'symbol not found' error from
	decode_line_1.
	(breakpoint_re_set): Don't emit newline before the
	reason why breakpoint is not reset.
	(do_enable_breakpoint): Don't specially process pending
	breakpoints.
	(free_bp_location): New.
	(break_command_1): For pending breakpoints, initialize
	all fields of a sal with zeroes.
	* breakpoint.h (re_enable_breakpoints_in_shlibs): Remove.
	* infcmd.c (post_create_inferior): Don't call
	re_enable_breakpoints_in_shlibs.
	* infrun.c (handle_inferior_event): Likewise.
	* solib-irix.c (irix_solib_create_inferior_hook): Likewise.
	* solib-osf.c (osf_solib_create_inferior_hook): Likewise.
	* win32-nat.c (get_win32_debug_event): Likewise.
	
	gdb/testsuite/
	* gdb.base/pending.exp: No longer expect "Pending breakpoint resolved"
	messages.
	* gdb.base/chng-syms.exp: Likewise.
	* gdb.base/unload.exp: Likewise.
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