[flang][cuda][NFC] Remove TODO implemented in semantic (#148058)

Author: clementval

flang/lib/Lower/Bridge.cpp

@@ -4842,8 +4842,6 @@ class FirConverter : public Fortran::lower::AbstractConverter {
                   .detailsIf<Fortran::semantics::ObjectEntityDetails>()) {
         if (details->cudaDataAttr() &&
             *details->cudaDataAttr() != Fortran::common::CUDADataAttr::Pinned) {
-          // TODO: This should probably being checked in semantic and give a
-          // proper error.
           assert(
               nbDeviceResidentObject <= 1 &&
               "Only one reference to the device resident object is supported");