GCOV: add cache for streamed locations.

GCOV: add cache for streamed locations.

2018-07-31  Martin Liska  <mliska@suse.cz>

        PR gcov-profile/85338
        PR gcov-profile/85350
        PR gcov-profile/85372
        * profile.c (struct location_triplet): New.
	(struct location_triplet_hash): Likewise.
	(output_location): Do not output a BB that
        is already recorded for a line.
	(branch_prob): Use streamed_locations.
2018-07-31  Martin Liska  <mliska@suse.cz>

        PR gcov-profile/85338
        PR gcov-profile/85350
        PR gcov-profile/85372
	* gcc.misc-tests/gcov-pr85338.c: New test.
	* gcc.misc-tests/gcov-pr85350.c: New test.
	* gcc.misc-tests/gcov-pr85372.c: New test.

From-SVN: r263113