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TrkGlobalChi2Fitter: Optimize some functions, even in dbg builds.

Scott Snyder requested to merge ssnyder/athena:opt.TrkGlobalChi2Fitter-20210402 into master

The function GlobalChi2Fitter::calculateJac makes heavy use of Eigen and runs extremely slowly in dbg builds. Adjust to compile this function with optimization, even in dbg builds. For the MuonCombinedConfig unit test, this results in a 5% speedup in the dbg build.

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