Merge pull request #2852 from icexin/bthread_cpu_time #1601

Job	Run time
gcc-compile-with-boringssl	18m 22s
gcc-compile-with-bazel	17m 14s
gcc-compile-with-cmake	3m 16s
gcc-compile-with-cmake-all-options	5m 17s
gcc-compile-with-make	2m 42s
gcc-compile-with-make-all-options	4m 36s
clang-compile-with-bazel	15m 59s
clang-compile-with-boringssl	16m 45s
clang-compile-with-cmake	2m 41s
clang-compile-with-make	2m 33s
clang-compile-with-make-all-options	5m 10s
gcc-compile-with-bazel-all-options	18m 8s
clang-compile-with-bazel-all-options	16m 19s
clang-compile-with-cmake-all-options	5m 0s
clang-unittest	15m 42s
	2h 29m 44s

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