zero-alloc cache (was Re: [v3] Fix PR libstdc++/10276)

[Jerry Quinn]

B. Kosnik writes:
 > >I just tried on an Athlon with the current 3.3 branch and valgrind
 > >1.9.5 is not showing any leaks.  Very odd ...  The caches for the
 > >stdio objects should still leak, no?  I have to go back and check on
 > >the other machine.
 > 
 > I see the leak on mainline. 

Does this mean that 3.3 calls destructors on the standard streams and
mainline does not?

Jerry