Reduce upper bound of high word to avoid addition rollover

Author: mborland

test/benchmark_i128.cpp

@@ -101,7 +101,7 @@ std::vector<T> generate_random_vector(std::size_t size = N, unsigned seed = 42U)
 
     std::mt19937_64 gen(seed);
     std::uniform_int_distribution<std::uint64_t> dist_low(UINT64_C(0), UINT64_MAX);
-    std::uniform_int_distribution<std::int64_t> dist_high(INT64_C(0), INT64_MAX);
+    std::uniform_int_distribution<std::int64_t> dist_high(INT64_C(0), INT64_MAX / 100);
     std::uniform_int_distribution<int> size_dist(0, 1);
 
     std::vector<T> result(size);