add support for bthread cpu usage #1591

Job	Run time
clang-compile-with-bazel	16m 12s
clang-compile-with-bazel	16m 12s
clang-compile-with-bazel-all-options	17m 12s
clang-compile-with-bazel-all-options	17m 12s
clang-compile-with-boringssl	16m 59s
clang-compile-with-boringssl	16m 59s
clang-compile-with-cmake	2m 57s
clang-compile-with-cmake	2m 57s
clang-compile-with-cmake-all-options	5m 20s
clang-compile-with-cmake-all-options	5m 20s
clang-compile-with-make	2m 49s
clang-compile-with-make	2m 49s
clang-compile-with-make-all-options	4m 39s
clang-compile-with-make-all-options	4m 39s
clang-unittest	15m 59s
clang-unittest	15m 59s
gcc-compile-with-bazel	16m 38s
gcc-compile-with-bazel	16m 38s
gcc-compile-with-bazel-all-options	18m 13s
gcc-compile-with-bazel-all-options	18m 13s
gcc-compile-with-boringssl	18m 26s
gcc-compile-with-boringssl	18m 26s
gcc-compile-with-cmake	3m 19s
gcc-compile-with-cmake	3m 19s
gcc-compile-with-cmake-all-options	5m 18s
gcc-compile-with-cmake-all-options	5m 18s
gcc-compile-with-make	3m 0s
gcc-compile-with-make	3m 0s
gcc-compile-with-make-all-options	2m 42s
gcc-compile-with-make-all-options	4m 58s
	5h 1m 42s

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