[Patch] Step2: don't use _M_out_lim in filebuf, have filebuf non unified, etc...

[Paolo Carlini]

Paolo Carlini wrote:

> Here, if both are moved 9876 regresses to the pre-patch performance... 

... however, adding -finline-limit=300 to the command line (that is 
_reducing_ it from its default 300), restores the performance... It 
looks like, for some reason, in a tight loop with only sputc, there is 
an over-inlining problem...

Anyway, those weirdness should be fixed with Honza work and, basing on 
general principles, I think we should move in any case both sputc and 
sbumpc inline. Do you agree? What about sungetc and sputbackc?

Paolo.