[Bug target/115362] fixed_size_simd dot product recognition not working for stdx::reduce

[jondaniel879 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115362

--- Comment #7 from Jon Daniel <jondaniel879 at gmail dot com> ---
sign of determinant result using the dot product differs from clang++ generated
binary