[PATCH] fold_builtin_FUNCTION

[Nathan Sidwell]

I notied the __builtin_FUNCTION () builtin was using raw DECL_NAME,
which for C++ dtors and conversion operators gives non-useful names.
(no ~ and 'operator N' for N= some int).

This patch fixes its folder to use the lang hook that provides a 
printable name.  I did contemplate passing 1 (add scope) to the hook, 
but decided against changing that.

Applied as obvious.

nathan

-- 
Nathan Sidwell
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