x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755]
Fixes [BZ# 28755] for wcsncmp by redirecting length >= 2^56 to __wcscmp_avx2. For x86_64 this covers the entire address range so any length larger could not possibly be used to bound `s1` or `s2`. test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass. Signed-off-by:Noah Goldstein <goldstein.w.n@gmail.com> (cherry picked from commit ddf0992c) (cherry picked from commit b50d5b74)
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