gcov: Add open mode parameter to gcov_do_dump()
gcc/
* gcov-tool.cc (gcov_do_dump): Add mode parameter.
(gcov_output_files): Open files for reading and writing.
libgcc/
* libgcov-driver-system.c (gcov_exit_open_gcda_file): Add mode
parameter. Pass mode to gcov_open() calls.
* libgcov-driver.c (dump_one_gcov): Add mode parameter. Pass mode to
gcov_exit_open_gcda_file() call.
(gcov_do_dump): Add mode parameter. Pass mode to dump_one_gcov()
calls.
(__gcov_dump_one): Open file for reading and writing.