[PATCH] Constant fold <string.h> library functions

[Roger Sayle]

Hi Jeff,
>  >I think a significant priority is to eliminate this duplication and
>  >synchronize builtins.c between mainline and tree-ssa.  This will fix
>  >the current issues and prevent things getting any worse.
> That's certainly a good thing -- but it's not something I can really
> tackle right now.  If you could help with that it would be a good thing.
>

I'm happy to do all the leg-work.  I just wanted to make sure that we
all agree its a reasonable goal, before I start submitting patches.

Roger
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