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

[Paul Eggert]

Thanks for working on that.  A few comments.  First, the ChangeLog 
entries can be improved; I put a proposed rewrite of them into the first 
two attached patches (the code's the same).  Second, building with 
--enable-gcc-warnings causes a complaint about dfasuperset needing to be 
declared pure.  Third, EGexecute still has quite a bit of duplicate 
code, even with the patch.  I took at shot at simplifying it (and fixing 
the 2nd problem) in the third attached patch.  This passes "make check" 
but I have not benchmarked it.

0001-grep-simplify-superset.patch
Description: Text document

0002-grep-adjust-timing-back-to-kwset-when-dfaisfast-is-t.patch
Description: Text document

0003-grep-simplify-EGexecute-further.patch
Description: Text document