[libFuzzer] explicitly use -fsanitize-coverage=trace-pc-guard in test/dump_coverage.test; mark print_coverage/dump_coverage as To-be-deprecated

git-svn-id: svn://svn.chromium.org/llvm-project/llvm/trunk/lib/Fuzzer@310877 0b72dbe1-c17f-4bc7-b9db-2b4152be0356
3 files changed