add optimize #478

Job	Run time
cpp14-coroutine	40s
basic-gcc-dbg-c++20-stdlibc++-asan	51s
aarch64	1m 1s
arenastring-gcc-stdlibc++-default	32s
basic-gcc-dbg-c++20-stdlibc++-tsan	36s
cmake	55s
arenastring-gcc-stdlibc++-half	31s
basic-gcc-dbg-c++14-stdlibc++-asan	45s
arenastring-gcc-stdlibc++-full	28s
basic-gcc-opt-c++20-stdlibc++-asan	27s
coverage	51s
arenastring-clang-stdlibc++-default	32s
compatible-gcc-9	27s
basic-gcc-opt-c++20-stdlibc++-tsan	31s
arenastring-clang-libc++-default	38s
workspace	30s
basic-gcc-opt-c++14-stdlibc++-asan	30s
basic-clang-dbg-c++20-stdlibc++-asan	47s
basic-clang-dbg-c++20-stdlibc++-tsan	34s
basic-clang-dbg-c++20-libc++-asan	45s
basic-clang-dbg-c++20-libc++-tsan	1m 26s
basic-clang-dbg-c++14-stdlibc++-asan	43s
basic-clang-dbg-c++14-libc++-asan	1m 8s
basic-clang-opt-c++20-stdlibc++-asan	43s
basic-clang-opt-c++20-stdlibc++-tsan	47s
basic-clang-opt-c++20-libc++-asan	36s
basic-clang-opt-c++20-libc++-tsan	47s
basic-clang-opt-c++14-stdlibc++-asan	31s
basic-clang-opt-c++14-libc++-asan	38s
	20m 10s

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