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CaloDetDescrManager return member string by const reference

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:lar_geometry_const_ref into master

CaloDetDescrManager return member string by const reference

This will not be a huge difference maker but was looking some code /profiling and what was effectively happening was like ("H8" is a literal) [https://godbolt.org/z/o5567h1ca] while one would have expected just the compare [https://godbolt.org/z/KqM6cofdd]

Edited by Christos Anastopoulos

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