[Bug libc/21018] New: Add memcchr function

["tetra2005 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21018

            Bug ID: 21018
           Summary: Add memcchr function
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: tetra2005 at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Recent FreeBSD have a nice complement for standard memchr function - memcchr
(https://www.freebsd.org/cgi/man.cgi?query=memcchr). It e.g. allows user to
efficiently check whether buffer is zeroed out. Would it make sense to add
something like this to Glibc as well (yes, I can volunteer)?

Here's a motivational GCC bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69908 (which also references
stackoverflow proving that problem is not that uncommon).

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