LTO and the inlining of functions only called once.

[Paolo Bonzini]

> We should also keep in mind that such logs aimed at users should support
> i18n - unlike the existing dumps for compiler developers, which are quite
> properly English only, and most calls to internal_error which should only
> appear if there is a compiler bug and are also only meant to be useful for
> compiler developers (so represent useless work for translators at present
> - though it does seem possible some internal_error calls could actually
> appear with invalid input rather than compiler bugs and so should be
> normal errors).

We should first support i18n of C++ error messages, which is totally 
broken for languages that have more than one case or more than one 
article form (e.g. singular and plural of "the").

Paolo