bug#17350: [PATCH] grep: speed up for a case to repeat failure in DFA after success in kwset

[Paul Eggert]

Thanks, I pushed that with minor changes to the ChangeLog message (first 
attached patch).  It's a tad faster to combine the relevant flags at 
compile-time so I did that (second attached patch).

"Iff" means "if and only if"; see <http://en.wikipedia.org/wiki/Iff>.  I
got the habit of trying to be logically-precise from RMS, who I guess
got it back in the days when he was doing AI.  Anyway, I reworded the 
text in a different way to avoid the misuse of "if" (third attached patch).

0001-dfa-speed-up-dfaisfast.patch
Description: Text document

0002-dfa-minor-performance-improvement-for-previous-chang.patch
Description: Text document

0003-dfa-clarify-use-of-if.patch
Description: Text document