compiler/optimizing/code_generator_x86.cc [5032:5044]:
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void LocationsBuilderX86::VisitNullCheck(HNullCheck* instruction) {
  LocationSummary::CallKind call_kind = instruction->CanThrowIntoCatchBlock()
      ? LocationSummary::kCallOnSlowPath
      : LocationSummary::kNoCall;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction, call_kind);
  Location loc = codegen_->IsImplicitNullCheckAllowed(instruction)
      ? Location::RequiresRegister()
      : Location::Any();
  locations->SetInAt(0, loc);
  if (instruction->HasUses()) {
    locations->SetOut(Location::SameAsFirstInput());
  }
}
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compiler/optimizing/code_generator_x86_64.cc [4471:4483]:
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void LocationsBuilderX86_64::VisitNullCheck(HNullCheck* instruction) {
  LocationSummary::CallKind call_kind = instruction->CanThrowIntoCatchBlock()
      ? LocationSummary::kCallOnSlowPath
      : LocationSummary::kNoCall;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction, call_kind);
  Location loc = codegen_->IsImplicitNullCheckAllowed(instruction)
      ? Location::RequiresRegister()
      : Location::Any();
  locations->SetInAt(0, loc);
  if (instruction->HasUses()) {
    locations->SetOut(Location::SameAsFirstInput());
  }
}
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