[Bug string/22603] ia64 memchr overflows internal pointer check

[joseph at codesourcery dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22603

--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
It's not invalid to pass such a size if you know the character is there - 
C11 says "The implementation shall behave as if it reads the characters 
sequentially and stops as soon as a matching character is found." - but 
it's certainly unusual for code to use such sizes.

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