Add branch hints for high performance messaging.

src/server/client.zig

@@ -65,6 +65,7 @@ pub fn start(self: *Client, io: std.Io, alloc: std.mem.Allocator, queue: *std.Io
                     _ = try self.to_client.write("\r\n");
                 },
                 .msg => |m| {
+                    @branchHint(.likely);
                     try self.to_client.print(
                         "MSG {s} {s} {s} {d}\r\n{s}\r\n",
                         .{
@@ -77,7 +78,7 @@ pub fn start(self: *Client, io: std.Io, alloc: std.mem.Allocator, queue: *std.Io
                     );
                 },
                 .hmsg => |hmsg| {
-                    std.log.debug("Sending hmsg: {any}", .{hmsg});
+                    @branchHint(.likely);
                     try self.to_client.print("HMSG {s} {s} {s} {d} {d}\r\n{s}\r\n", .{
                         hmsg.msg.subject,
                         hmsg.msg.sid,

src/server/message_parser.zig

@@ -297,9 +297,11 @@ pub const Message = union(MessageType) {
                 return .{ .connect = try res.dupe(alloc) };
             },
             .@"pub" => {
+                @branchHint(.likely);
                 return parsePub(alloc, in);
             },
             .hpub => {
+                @branchHint(.likely);
                 return parseHPub(alloc, in);
             },
             .ping => {