message: fix regression in preprocessor discarding too may global vars
diff: @@ -1139,9 +1139,8 @@ void Transform::preprocess() {
  // verify the transformation
  // We only remove inits if it's possible to remove from both programs to keep
  // memories syntactically equal
  - auto remove_init_src = can_remove_init(src);
  auto remove_init_tgt = can_remove_init(tgt);
  - for (auto &[name, isrc] : remove_init_src) {
  + for (auto &[name, isrc] : can_remove_init(src)) {
  auto Itgt = remove_init_tgt.find(name);
  if (Itgt == remove_init_tgt.end())
  continue;
  @@ -1151,8 +1150,9 @@ void Transform::preprocess() {
  }
  // remove constants introduced in target
  + auto src_gvs = src.getGlobalVarNames();
  for (auto &[name, itgt] : remove_init_tgt) {
  - if (!remove_init_src.count(name))
  + if (find(src_gvs.begin(), src_gvs.end(), name.substr(1)) == src_gvs.end())
  tgt.getFirstBB().delInstr(itgt);
  }
  