bug#17306: grep: skip checking of multibyte character boundary, reaching at eolbyte

[Paul Eggert]

Norihiro Tanaka wrote:
> In dfaexec(), if reaches at eolbyte, we can skip checking of multibyte
> character boundary.  So then process mbp until here.

Thanks, I installed that.  The "mbp = p" assignment can be done 
unconditionally.  Some of the other code in the neighborhood can stand 
some minor cleanups too, so I did that as per the attached patches.

0001-dfa-simplify-and-be-more-consistent-about-MB_CUR_MAX.patch
Description: Text document

0002-dfa-minor-simplification-of-dfaexec.patch
Description: Text document