[core] inline connection_read_header()
[core] inline connection_read_header()

inline connection_read_header() into connection_handle_read_state()

(The large stack usage prevents the compiler from inlining the routine,
 but if we enter connection_handle_read_state(), then we are going to
 be running connection_read_header(), so put them together)

lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4