This patch fixes some of the issues noted on PR 41550. In particular,
it changes from using a file with a hard coded name to using a plugin
argument. It also fixes a bug: get_symbols reads the syms argument to
find if a symbol is a definition or a use. Because of this, we must
pass it the original symbols, not a freshly allocated table.

I tested this by writing the resolution file for a simple case with 2
files. Is there anyway of adding tests like this to the testsuite?
What it has to do is

*) Compile two C files with -flto
*) Run gold with -plugin-opt=-resolution=foo
*) Run grep on foo

I will update the gcc driver in a next patch. Since nothing is using
the resolution file right now, this shouldn't be a problem.

2009-10-14  Rafael Avila de Espindola  <espindola@google.com>

	* lto-plugin.c (resolution_file): New.
	(free_1): Update comment.
	(write_resolution): Write resolution to specified file. Use the
	syms array from the symbol table.
	(all_symbols_read_handler): Delay call to free_1 past call to
	write_resolution.
	(process_option): Add a -resolution option.

Cheers,
-- 
Rafael Ávila de Espíndola