Switch to include_optimized once Revise handles the 2-argument form of include

[ranocha]

See #643 (comment) and timholy/Revise.jl#634. The necessary code is still included but commented out

# TODO: include_optimized
# This should be used everywhere (except to `include("interpolations.jl")`)
# once the upstream issue https://github.com/timholy/Revise.jl/issues/634
# is fixed; tracked in https://github.com/trixi-framework/Trixi.jl/issues/664.
# # By default, Julia/LLVM does not use fused multiply-add operations (FMAs).
# # Since these FMAs can increase the performance of many numerical algorithms,
# # we need to opt-in explicitly.
# # See https://ranocha.de/blog/Optimizing_EC_Trixi for further details.
# function include_optimized(filename)
#   include(expr -> quote @muladd begin $expr end end, filename)
# end