[Bug target/110675] Using std::set with avx2 pragma is broken on latest gcc version (compilation fails)

[xry111 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110675

--- Comment #2 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
Clearly related to PR109753, but I'm not sure if it's OK to just mark it as a
dup.