Berk Hess authored Feb 20, 2024 and Andrey Alekseenko committed Feb 20, 2024

The NBNxM i-cluster size has been changed form a single constant
to a, constexpr, lookup based on the kernel type. This enables
more flexible changing of the i-cluster size.

This also fixed a minor issue where the PP computation cost for
determining the PP/PME balance was slightly overestimated with AVX
(not AVX2), due to checking for GMX_SIMD_HAVE_FMA being defined
instead of checking its value.