Opt stb #481

Job	Run time
clang-compile-with-bazel-all-options	16m 55s
clang-compile-with-bazel	15m 59s
clang-compile-with-boringssl	17m 7s
clang-compile-with-cmake	2m 49s
clang-compile-with-cmake-all-options	4m 53s
clang-compile-with-make	3m 1s
clang-compile-with-make-all-options	5m 26s
clang-unittest	16m 22s
gcc-compile-with-bazel	18m 1s
gcc-compile-with-bazel-all-options	18m 23s
gcc-compile-with-boringssl	17m 56s
gcc-compile-with-cmake	3m 1s
gcc-compile-with-cmake-all-options	5m 34s
gcc-compile-with-make	2m 52s
gcc-compile-with-make-all-options	5m 40s
	2h 33m 59s

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