add 64 mb test

bin/benchmark/main.c

@@ -97,7 +97,7 @@ int main(void) {
 
             // get buffer sizes large enough that all the simd code paths get hit hard, but
             // also measure the smaller buffer paths since they often can't be optimized as thoroughly.
-            size_t buffer_sizes[] = {8, 16, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 524288};
+            size_t buffer_sizes[] = {8, 16, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 524288, 1048576};
             size_t buffer_sizes_len = AWS_ARRAY_SIZE(buffer_sizes);
 
             // warm it up to factor out the cpuid checks: