set tags workers unlimitedly #1526

Job	Run time
clang-compile-with-bazel	10m 20s
clang-compile-with-bazel-all-options	10m 54s
clang-compile-with-boringssl	11m 34s
clang-compile-with-cmake	2m 58s
clang-compile-with-cmake-all-options	5m 0s
clang-compile-with-make-all-options	4m 50s
clang-compile-with-make	2m 58s
clang-unittest	15m 45s
gcc-compile-with-bazel	11m 28s
gcc-compile-with-bazel-all-options	12m 17s
gcc-compile-with-boringssl	12m 40s
gcc-compile-with-cmake	3m 13s
gcc-compile-with-cmake-all-options	5m 38s
gcc-compile-with-make	2m 32s
gcc-compile-with-make-all-options	4m 41s
	1h 56m 48s

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