lto-streamer.c (write_symbol_vec): Rename to ...

	* lto-streamer.c (write_symbol_vec): Rename to ...
	(write_symbol) ... this one; write only symbol given and when
	present in cache. Sanity check that what is defined is present
	in cgraph/varpool with body/finalized decl.
	(write_symbols_of_kind): Remove.
	(produce_symtab): Take outputblock and sets; use cgraph/varpool/alias
	pairs to produce symtab.
	(produce_asm_for_decls): Update call of produce_symtab; don't do so
	when doing WPA streaming.

From-SVN: r161868