CaloIdentifier: Use CXXUTILS_TRAPPING_FP.
Use CXXUTILS_TRAPPING_FP in FCAL_ChannelMap to tell clang to optimize assuming that FP operations may trap.
Fixes test failures in the clang build in MuonCombinedConfig.
Use CXXUTILS_TRAPPING_FP in FCAL_ChannelMap to tell clang to optimize assuming that FP operations may trap.
Fixes test failures in the clang build in MuonCombinedConfig.