add optimize #476

Job	Run time
cpp14-coroutine	37s
compatible-gcc-9	30s
aarch64	58s
cmake	2m 33s
arenastring-gcc-stdlibc++-default	50s
basic-gcc-dbg-c++20-stdlibc++-asan	56s
arenastring-gcc-stdlibc++-half	43s
basic-gcc-dbg-c++20-stdlibc++-tsan	1m 25s
coverage	48s
arenastring-gcc-stdlibc++-full	45s
workspace	29s
arenastring-clang-stdlibc++-default	3m 22s
basic-gcc-dbg-c++14-stdlibc++-asan	1m 3s
basic-gcc-opt-c++20-stdlibc++-asan	39s
arenastring-clang-libc++-default	3m 44s
basic-gcc-opt-c++20-stdlibc++-tsan	33s
basic-gcc-opt-c++14-stdlibc++-asan	37s
basic-clang-dbg-c++20-stdlibc++-asan	3m 24s
basic-clang-dbg-c++20-stdlibc++-tsan	3m 41s
basic-clang-dbg-c++20-libc++-asan	3m 58s
basic-clang-dbg-c++20-libc++-tsan	3m 46s
basic-clang-dbg-c++14-stdlibc++-asan	2m 57s
basic-clang-dbg-c++14-libc++-asan	3m 14s
basic-clang-opt-c++20-stdlibc++-asan	3m 31s
basic-clang-opt-c++20-stdlibc++-tsan	4m 1s
basic-clang-opt-c++20-libc++-asan	3m 52s
basic-clang-opt-c++20-libc++-tsan	4m 2s
basic-clang-opt-c++14-stdlibc++-asan	2m 56s
basic-clang-opt-c++14-libc++-asan	3m 12s
	1h 3m 6s

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