* bcache.c (bcache_data): Call deprecated_bcache_added function.

	* bcache.c (bcache_data): Call deprecated_bcache_added function.
	(deprecated_bcache_added): New function name. Body of function
	bcache_data is used here with the addition of 'added' argument.
	* bcache.h (deprecated_bcache_added): New function.
	* symfile.c (add_psymbol_to_bcache): New helper function, takes part of
	work from add_psymbol_to_list - initialises partial symbol and stashes
	it in objfile's cache.
	(append_psymbol_to_list): New helper function, takes other part of
	work from add_psymbol_to_list - adds partial symbol to the given list.
	(add_psymbol_to_list): Call helper functions instead of doing work
	here. If adding to global list, do not duplicate partial symbols in the
	partial symtab.