episode 7: Optimisation: Reductions, collapse

[wikfeldt]

• do-concurrent, loop, OpenMP 5 vs 4.5
• discuss what is supported by different compilers

[mabraham]

Stub for this lesson at https://github.com/ENCCS/openmp-gpu/blob/main/content/optimization.rst

Can we have some working examples adapting the mini-app? see https://github.com/ENCCS/openmp-gpu/tree/main/content/code-samples/serial for baseline code to improve?