add new v3 opt+g platforms for the throughput tests

I would like to add these platforms to start building opt+g in the nightlies as default platform for the throughput tests.

assigned to @clemenci

what about gcc10fp-opt+g instead?

mentioned in merge request LHCbNightlyConf!703 (merged)

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@clemenci I've implemented the changes as discussed.

I couldn't use CMAKE_{LANG}_FLAGS_RELWITHDEBINFO_INIT variables because cmake would append its default flags to what I set there, so I would end up with `-O3 -g -DNDEBUG -O2 -g -DNDEBUG"

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• 6780f137 - add new v3 opt+g platforms for the throughput tests

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mentioned in commit 10ccad4c

merged

mentioned in merge request !74 (merged)