FPGATrackSimFitConstantBank: silenced clang warning
Commented out one private data member that has recently become unused.
As a result of the changes in FPGATrackSimFitConstantBank
introduced by !70838 (merged) the m_isFirstStage
has become unused.
Some TODO
comments accompany the changes, so I'm not sure if the unused data member will become useful again or not.
That's why I'm commenting it out for now instead of removing it.
CC @brosser for info and comments