iconv changes

[Ulrich Drepper]

Hi,

Andreas reported some days ago that the iconv functions require a
large part of the startup time.  The implementation was really kind of
stupid.  The last changes I did were meant to make things work
correctly but I didn't expect them to be slow.

I've now hopefully fixed this.  I'm now using better algorithms
without O(n^2) behaviour.

I haven't seen any regressions but please give it a try yourself.  And
if somebody can come up with some timing results (before, after) I'd
appreciate seeing them.

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