[PATCH] Move cpp_macro to cpplib.h

[Nathan Sidwell]

Way back Geoff Keating broke cpp-id-data.h out of internal.h so that PCH 
could write out tokenized macro definitions.  That removed the need to 
stringize and retokenize them.  cpp-id-data.h was fed to the gty 
machinery, and users of cpplib continued to use cpplib.h unaware of the 
cpp_macro definition.  but some of its effects are felt in cpplib.h (the 
GTY markup for instance).

Since then we now include cpp-id-data.h in a few places where we need to 
look inside a cpp_macro.  That's a nasty hole punched through the 
abstraction layer :(

This patch moves a couple of cpplib-internal declarations to internal.h 
and moves cpp_macro to cpplib.h, thereby exposing it to users properly. 
The remains of cpp-id-data.h will evaporate with this patch series, but 
we're not there yet.

This allows the includers of cpp-id-data.h to become better citizens and 
use cpplib.h.  I'll be morphing the cpp_macro definition, but thought it 
better to move then morph, than vice-versa.

booted & tested on x86_64-linux

nathan
-- 
Nathan Sidwell
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