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MuonTrackFinderTools: Work around spurious FPE with clang.

Scott Snyder requested to merge ssnyder/athena:fpeclang.MuonTrackFinderTools-20230809 into main

Tell clang to optimize MuonTrackCleaner::init assuming that FP exceptions can trap. Otherwise, it can vectorize the division, which can lead to spurious division-by-zero traps from unused vector lanes.

Needed to fix test failures in MuonCombinedConfig in the clang build.

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