Merge "Clean up dead code." into main

        return Dexopt();

    }

    ////////////////////////////////////

    // Helpers, mostly taken from ART //

    ////////////////////////////////////

    // Choose a random relocation offset. Taken from art/runtime/gc/image_space.cc.

    static int32_t ChooseRelocationOffsetDelta(int32_t min_delta, int32_t max_delta) {

        constexpr size_t kPageSize = PAGE_SIZE;

        static_assert(IsPowerOfTwo(kPageSize), "page size must be power of two");

        CHECK_EQ(min_delta % kPageSize, 0u);

        CHECK_EQ(max_delta % kPageSize, 0u);

        CHECK_LT(min_delta, max_delta);

        std::default_random_engine generator;

        generator.seed(GetSeed());

        std::uniform_int_distribution<int32_t> distribution(min_delta, max_delta);

        int32_t r = distribution(generator);

        if (r % 2 == 0) {

            r = RoundUp(r, kPageSize);

        } else {

            r = RoundDown(r, kPageSize);

        }

        CHECK_LE(min_delta, r);

        CHECK_GE(max_delta, r);

        CHECK_EQ(r % kPageSize, 0u);

        return r;

    }

    static uint64_t GetSeed() {

#ifdef __BIONIC__

        // Bionic exposes arc4random, use it.

        uint64_t random_data;

        arc4random_buf(&random_data, sizeof(random_data));

        return random_data;

#else

#error "This is only supposed to run with bionic. Otherwise, implement..."

#endif

    }

    void AddCompilerOptionFromSystemProperty(const char* system_property,

            const char* prefix,

            bool runtime,

            std::vector<std::string>& out) const {

        const std::string* value = system_properties_.GetProperty(system_property);

        if (value != nullptr) {

            if (runtime) {

                out.push_back("--runtime-arg");

            }

            if (prefix != nullptr) {

                out.push_back(StringPrintf("%s%s", prefix, value->c_str()));

            } else {

                out.push_back(*value);

            }

        }

    }

    static constexpr const char* kBootClassPathPropertyName = "BOOTCLASSPATH";

    static constexpr const char* kAndroidRootPathPropertyName = "ANDROID_ROOT";

    static constexpr const char* kAndroidDataPathPropertyName = "ANDROID_DATA";