benchmark: prealloc arrays

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: hazeycode

src/benchmark.zig

@@ -245,9 +245,9 @@ noinline fn cross3ScaleBiasBenchmark(allocator: std.mem.Allocator, comptime coun
 noinline fn cross3Dot3ScaleBiasBenchmark(allocator: std.mem.Allocator, comptime count: comptime_int) !void {
     std.debug.print("{s:>42} - ", .{"cross3, dot3, scale, bias benchmark (AOS)"});
 
-    var data0 = try std.ArrayList([3]f32).initCapacity(allocator, 0);
+    var data0 = try std.ArrayList([3]f32).initCapacity(allocator, 256);
     defer data0.deinit(allocator);
-    var data1 = try std.ArrayList([3]f32).initCapacity(allocator, 0);
+    var data1 = try std.ArrayList([3]f32).initCapacity(allocator, 256);
     defer data1.deinit(allocator);
 
     var i: usize = 0;