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CaloDetDescr: Work around spurious FPE with clang.

Scott Snyder requested to merge ssnyder/athena:fpeclang.CaloDetDescr-20221121 into master

Reorder code in CaloSuperCellIDTool::initIDMap to prevent a vectorization that can lead to division by zero in unused vector lanes causing a spurious FPE.

Needed to fix MuonCombinedConfig unit test failure in the clang build.

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