bug#16842: [PATCH] Use mbrtowc_cache in DFA engine

[Paul Eggert]

Thanks very much.  I read through that patch and think we can come up 
with a simpler cache that need not store lengths, but reserves WEOF to 
represent an incomplete multibyte character.  This approach simplifies 
the code and avoids some glitches when mbrtowc returns special values 
not in the range 1..N.  How about the attached patch instead?

0001-dfa-cache-results-of-mbrtowc-for-speed.patch
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