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

[Paul Eggert]

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.  Please give them a try if you have the time.  I 
doubt whether this will "solve" the performance problem entirely with -P 
and encoding errors but at least it should be heading in the right 
direction.

0001-grep-remove-refactor-unnecessary-code-about-line-spl.patch
Description: Text document

0002-grep-speed-up-P-on-files-containing-many-multibyte-e.patch
Description: Text document

0003-grep-use-bool-for-boolean-in-grep.c.patch
Description: Text document

0004-grep-treat-a-file-as-binary-if-its-prefix-contains-e.patch
Description: Text document

0005-grep-improve-performance-for-older-glibc.patch
Description: Text document

0006-grep-use-mbclen-cache-more-effectively.patch
Description: Text document