[Bug c++/68125] std::sqrt prevent use of associative math

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68125

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
With a snapshot from Oct 14, I am getting the same code (using rsqrtss) for
both functions. Maybe it is already fixed?