MappedScop::mapToThreads: update comment to change in mapping order

The comment was left unchanged when the mapping order was changed
from starting from the outermost band mender to starting from
the innermost band member.

Author: Sven Verdoolaege

tc/core/polyhedral/cuda/mapped_scop.cc

@@ -367,8 +367,8 @@ size_t MappedScop::mapToThreads(detail::ScheduleTree* band, size_t nInner) {
   }
   // With current isl scheduler, if coincident dimensions exist in a band,
   // they are outermost.
-  // If a band has more than 3 coincident dimensions, this will choose
-  // outermost, but we may also want innermost.
+  // If a band has more than 3 coincident dimensions,
+  // then the innermost of those will be used.
   auto nOuterCoincident = bandNode->nOuterCoincident();
   if (!bandNode->permutable_ || nOuterCoincident < 1) {
     return nInner;