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.