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Dropped usage of (UN)LIKELY macro

Sebastien Ponce requested to merge sponce_dropLIKELYUsage into master

This drops the usage of the (UN)LIKELY macros in the Gaudi code. At that stage the definition stays.

The idea behind is that the branch predictors of the modern processors are good enough to avoid this complexity in the code. Tests on LHCb code have actually proven that the usage of these macros make absolutely no difference in timing.

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