[C++] Deprecating default arguments on function types

[Nathan Sidwell]

Can we deprecate
	typedef int (*P) (int = 1);
	int f (P p) { return p ();}
?

3.4 only allows it (with pedwarn) when -fpermissive is in effect.
I'd like to deprecate it entirely. (deprecate in 3.4, remove in 3.5)

Rationale: Other than not being C++, I have a protopatch which improves
the speed of type comparisons. However, getting that into a sensible shape
within the current type handling machinery would be assisted (though not
impossible without change) by putting default argument expressions on
DECL_INITIAL of a function's PARM_DECLs.

nathan
-- 
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          The voices in my head said this was stupid too
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