Merge changes I4ef7c6f2,Ia8201e8a am: 0353f423

                        // 2. threadLoop_mix (significant for heavy mixing, especially

                        //                    on low tier processors)

                        // it's OK if deltaMs is an overestimate.

                        const int32_t deltaMs =

                                (lastWriteFinished - previousLastWriteFinished) / 1000000;

                        const int32_t throttleMs = mHalfBufferMs - deltaMs;

                        // it's OK if deltaMs (and deltaNs) is an overestimate.

                        nsecs_t deltaNs;

                        // deltaNs = lastWriteFinished - previousLastWriteFinished;

                        __builtin_sub_overflow(

                            lastWriteFinished,previousLastWriteFinished, &deltaNs);

                        const int32_t deltaMs = deltaNs / 1000000;

                        const int32_t throttleMs = (int32_t)mHalfBufferMs - deltaMs;

                        if ((signed)mHalfBufferMs >= throttleMs && throttleMs > 0) {

                            usleep(throttleMs * 1000);

                            // notify of throttle start on verbose log

}

template <typename T, size_t n>

constexpr T fnv1a(const char (&file)[n], int i = n - 1) {

__attribute__((no_sanitize("unsigned-integer-overflow")))

constexpr T fnv1a(const char (&file)[n], ssize_t i = (ssize_t)n - 1) {

    return i == -1 ? offset_basis<T>() : (fnv1a<T>(file, i - 1) ^ file[i]) * FNV_prime<T>();

}