Allow cgraph nodes to change name

[Nathan Sidwell]

Zack Weinberg wrote:
> Geoff Keating <geoffk@geoffk.org> writes:

>>>From: "Zack Weinberg" <zack@codesourcery.com>

>>>Er, DECL nodes are supposed to be unique for each function, aren't they?
>>
>>Not really, I believe:
> 
> [...]
> 
> Currently true, yes.  But this causes problems in other areas, notably
> targets where external symbol references have to be called out as such
> in assembly... hence my "supposed to be."
in C++ you can have the following

namespace N {
   extern "C" void Foo (int = 5);
};

namespace M {
   extern "C" void Foo (int = 7);
};

those Foo's are the same C function, but have different default parameters!

nathan

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          The voices in my head said this was stupid too
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