bug#18454: Improve performance when -P (PCRE) is used in UTF-8 locales

[Paul Eggert]

Jim Meyering wrote:

> I've pushed this follow-up patch to suppress a new warning:

Thanks, I expect I didn't get that warning because I built on x86-64, which 
allows unaligned accesses so GCC doesn't complain.  (Incidentally, I had already 
tried modifying the code to exploit the fact that unaligned accesses are OK on 
x86ish platforms, but that made the word-by-word loop go slower, so no dice.)

Too bad GCC isn't smart enough to notice that the pointer must be aligned.  It 
strikes me that this problem must come up elsewhere, and that it's worth writing 
a macro to encapsulate the situation.  I pushed the attached follow-up patch, 
which is an attempt to move in that direction.

0001-maint-generalize-the-Wcast-align-fix.patch
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