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MuonReadoutGeometryR4: Speed up tube layer sorting.

Scott Snyder requested to merge ssnyder/athena:sortSpeedup.MuonReadoutGeometryR4-20240430 into main

In the comparison function for MdtTubeLayer, don't bother calling the underlying comparison functions if the objects being compared are identical. GeoPhysValSorter, in particular, is expensive to call. This speeds things up considerably, especially in the debug build.

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