[PATCH] decl lang hooks

[Nathan Sidwell]

cp/name-lookup has a twisty maze of forwarding functions.  One reason is 
that a couple of the names are used directly by c-common.c.  However, we 
now have lang hooks for these things.

This patch changes the C++ FE to override the pushdecl and getdecl lang 
hooks.  In addition to simply overriding them there, I had to fixup a 
couple of places in c-family/c-common.c and 
objc/objc-gnu-runtime-abi-01.c to use the pushdecl hook.

This patch doesn't reduce the twisty maze, but will enable me to do so 
shortly.

ok?

nathan
-- 
Nathan Sidwell
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