[Patch/RFC] Atomic builtins clean up

[Paolo Carlini]

Hi,

before minimally fixing 24692 I'd like to install a clean up like the 
below (in testing on x86-linux and ia64-linux), already mentioned time ago.

Anyone disagreeing with the idea of putting this new "generic" 
implementation of atomicity.h, exploiting the atomic builtins, under 
config/cpu/generic/atomic_builtins? I'm open to alternate suggestions... 
For instance, at first I had it one level above, in 
config/cpu/atomic_builtins, but that way I think it's not clear that we 
are talking about a generic implementation after all and that generic 
implementations of other cpu files, like atomic_word.h, can go with it.

Paolo.

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