Since #20233 compiling with clang 10.0 fails:
```
bench/addrman.cpp:113:32: error: non-constant-expression cannot be narrowed from type 'unsigned long long' to 'size_t' (aka 'unsigned int') in initializer list [-Wc++11-narrowing]
    const size_t addrman_count{bench.epochs() * bench.epochIterations()};
                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bench/addrman.cpp:113:32: note: insert an explicit cast to silence this issue
    const size_t addrman_count{bench.epochs() * bench.epochIterations()};
                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                               static_cast<size_t>(                    )
1 error generated.
make[2]: *** [Makefile:12508: bench/bench_bitcoin-addrman.o] Error 1
```
#include <addrman.h>
#include <bench/bench.h>
#include <random.h>
#include <util/time.h>
#include <optional>
#include <vector>
static constexpr size_t NUM_SOURCES = 64;
static constexpr size_t NUM_ADDRESSES_PER_SOURCE = 256;
static std::vector<CAddress> g_sources;
static std::vector<std::vector<CAddress>> g_addresses;
static void CreateAddresses()