bug#18266: handling bytes not part of the charset, and other garbage

[Paul Eggert]

Paul Eggert wrote:
> Attached are some proposed patches which should improve the performance
> of grep -P when applied to binary files, among other things.  I have
> some other ideas for boosting performance further but thought I'd
> publish these first.

I pushed those patches, along with the attached further patches to fix 
up some porting glitches and bugs I encountered in subsequent testing. 
I plan to follow up soon on Bug#18454 with more performance-related 
patches in this area.

0007-grep-avoid-false-alarms-for-mb_clen-and-to_uchar.patch
Description: Text document

0008-grep-use-mbclen-cache-in-one-more-place.patch
Description: Text document

0009-grep-port-P-speedup-to-hosts-lacking-PCRE_STUDY_JIT_.patch
Description: Text document

0010-grep-fix-P-speedup-bug-with-empty-match.patch
Description: Text document