[rfa] libiberty: splay tree performance improvement

[Frank Ch. Eigler]

Hi -

rth wrote:

> > The opaque key value is already copied among nodes within the tree,
> > [...] so the key objects cannot be that transient.
> 
> That's for keys stored in the tree.  Keys presented via lookup
> needn't be stable.

You're right.  So does this new requirement sound acceptable,
or else shall I fork splay-tree for libmudflap's pattern of usage?

- FChE
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