[libsharp] add -O3 CFLAGS #4501
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Testing on my own machine suggests that Libsharp is really an anomaly, and O3 has a factor of three (!) performance difference.
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Testing on a relatively recent Cascade Lake machine suggests that Libsharp is really an anomaly, and O3 has a factor of three (!) performance difference.
@ziotom78
I think this will close ziotom78/Libsharp.jl#2