libgcc/ChangeLog:

	* libgcov-driver.c (merge_summary): Remove function as its name
	is misleading and doing something different.
	(dump_one_gcov): Add ATTRIBUTE_UNUSED for 2 args. Take read summary
	in gcov-tool.
	* libgcov-util.c (curr_object_summary): Remove.
	(read_gcda_file): Remove unused curr_object_summary.
	(gcov_merge): Merge summaries.
	* libgcov.h: Add summary argument for gcov_info struct.