Note that I was thinking of similar attribute for C++ iostream initialization
code.
Currently every unit including iostream gets a call to the iostream
constructor. With LTO
we merge the constructors together and get _alot_ of redundant calls to the
construction
code. Declaring that only first call is needed would save some (quite minor)
startup
overehead. (overhead of iostream startup is large, but after inlning all
together it
boils down to cca 7000 redundant calls in Mozilla startup that executes quite
quickly)
