236     DCHECK(first_use_ == nullptr) << "A temporary can only have one user";  in AddTempUse()
239     first_use_ = new (allocator_) UsePosition(  in AddTempUse()
240         instruction, /* environment */ nullptr, temp_index, position, first_use_);  in AddTempUse()
271     if ((first_use_ != nullptr)
272         && (first_use_->GetUser() == instruction)
273         && (first_use_->GetPosition() < position)) {
277       UsePosition* cursor = first_use_;
281       DCHECK(first_use_->GetPosition() + 1 == position);
285       if (first_range_->GetEnd() == first_use_->GetPosition()) {
295       first_use_ = new (allocator_) UsePosition(
296           instruction, environment, input_index, position, first_use_);
334     first_use_ = new (allocator_) UsePosition(  in AddPhiUse()
335         instruction, /* environment */ nullptr, input_index, block->GetLifetimeEnd(), first_use_);  in AddPhiUse()
489     UsePosition* use = first_use_;  in FirstRegisterUseAfter()
517     UsePosition* use = first_use_;  in FirstUseAfter()
530     return first_use_;  in GetFirstUse()
589     new_interval->first_use_ = first_use_;  in SplitAt()
662     UsePosition* use = first_use_;  in Dump()
773     if (first_use_ != nullptr) {
774       high_or_low_interval_->first_use_ = first_use_->Dup(allocator_);
876         first_use_(nullptr),  in allocator_()
947     UsePosition* use = first_use_;  in HasSynthesizeUseAt()
982       if ((first_use_ != nullptr) && (first_use_->GetPosition() <= back_edge_use_position)) {  in AddBackEdgeUses()
1011       last_in_new_list->SetNext(first_use_);  in AddBackEdgeUses()
1012       first_use_ = first_in_new_list;  in AddBackEdgeUses()
1032   UsePosition* first_use_;  variable