[Patch / RFA] Use builtins for the classification macros

[Paolo Carlini]

Hi,

I'm finishing testing on x86_64-linux this patch: in my experiments, we
get optimal code generation for constant arguments and we shave a couple
of K of templates from a very used header. Can you imagine anything
wrong with it? (I'm explicitly adding Richard in CC, as middle-end
maintainer).

Paolo.

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