Make buildsym set-up/tear-down more consistent, and document it.

gdb/ChangeLog:

	* buildsym.c: Add comments describing how the buildsym machinery
	is used by the various file formats.
	(really_free_pendings): Enhance function comment.
	See pending_macros to NULL.  Simplify resetting pending_addrmap.
	Call free_buildsym_compunit.
	(free_buildsym_compunit): Set current_subfile to NULL.
	(prepare_for_building): New function.
	(start_symtab): Call it.  Remove call to set_last_source_file.
	(restart_symtab): New arg "cust".  All callers updated.
	Simplify, call prepare_for_building.  Re-initialize buildsym_compunit.
	(reset_symtab_globals): Enhance function comment.
	Set local_symbols, file_symbols, global_symbols to NULL.
	Set pending_macros to NULL.  Simplify resetting pending_addrmap.
	Call free_buildysym_compunit.
	(end_symtab_without_blockvector): Delete.  All callers updated.
	(end_symtab_with_blockvector): Remove redundant call to
	free_buildsym_compunit.
	(augment_type_symtab): Remove arg "cust".  All callers updated.
	(buildsym_init): Remove resetting of free_pendings, file_symbols,
	global_symbols, pending_blocks, pending_macros.  Instead make
	handling consistent with pending_addrmap: Assert value was reset
	at end of previous symtab building.  Initialize context_stack here.

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