bthread task group add tag #624

Job	Run time
gcc-compile-with-cmake	4m 27s
gcc-compile-with-bazel	25m 3s
gcc-compile-with-make-all-options	6m 40s
gcc-compile-with-make	5m 45s
clang-compile-with-bazel	28m 17s
clang-compile-with-bazel-all-options	23m 6s
clang-compile-with-cmake	3m 24s
clang-compile-with-cmake-all-options	6m 22s
clang-compile-with-make	3m 26s
clang-compile-with-make-all-options	7m 15s
clang-unittest	11m 44s
gcc-compile-with-bazel-all-options	30m 5s
gcc-compile-with-cmake-all-options	7m 28s
	2h 43m 2s

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