compiler/utils/x86/assembler_x86.cc [1887:1899]:
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void X86Assembler::EmitLabelLink(NearLabel* label) {
  CHECK(!label->IsBound());
  int position = buffer_.Size();
  if (label->IsLinked()) {
    // Save the delta in the byte that we have to play with.
    uint32_t delta = position - label->LinkPosition();
    CHECK(IsUint<8>(delta));
    EmitUint8(delta & 0xFF);
  } else {
    EmitUint8(0);
  }
  label->LinkTo(position);
}
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compiler/utils/x86_64/assembler_x86_64.cc [2446:2458]:
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void X86_64Assembler::EmitLabelLink(NearLabel* label) {
  CHECK(!label->IsBound());
  int position = buffer_.Size();
  if (label->IsLinked()) {
    // Save the delta in the byte that we have to play with.
    uint32_t delta = position - label->LinkPosition();
    CHECK(IsUint<8>(delta));
    EmitUint8(delta & 0xFF);
  } else {
    EmitUint8(0);
  }
  label->LinkTo(position);
}
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