[google]: initialize language field for clone function struct

[Eric Botcazou]

> Sure, but that's a limitation of out SAVE_EXPR handling (given that it
> would be ok to expand the SAVE_EXPR multiple times - once per
> "instantiation context").

You need to expand the initializer exactly once and you need to make sure that 
this occurrence is invoked before all the others at run time.  Not trivial.

-- 
Eric Botcazou