Clang warning on IRegSelLUT
Try to fix warnings of the form
cvmfs/sft.cern.ch/lcg/releases/gcc/9.2.0-afc57/x86_64-centos7/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../include/c++/9.2.0/bits/unique_ptr.h:81:2: warning: delete called on 'IRegSelLUT' that is abstract but has non-virtual destructor [-Wdelete-abstract-non-virtual-dtor]
delete __ptr;
Also used a bit nullptr
and emplace_back
where applicable.