compiler/optimizing/code_generator_x86.cc [621:636]:
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  Register FindAvailableCallerSaveRegister(CodeGenerator* codegen) {
    size_t ref = static_cast<int>(ref_.AsRegister<Register>());
    size_t obj = static_cast<int>(obj_.AsRegister<Register>());
    for (size_t i = 0, e = codegen->GetNumberOfCoreRegisters(); i < e; ++i) {
      if (i != ref && i != obj && !codegen->IsCoreCalleeSaveRegister(i)) {
        return static_cast<Register>(i);
      }
    }
    // We shall never fail to find a free caller-save register, as
    // there are more than two core caller-save registers on x86
    // (meaning it is possible to find one which is different from
    // `ref` and `obj`).
    DCHECK_GT(codegen->GetNumberOfCoreCallerSaveRegisters(), 2u);
    LOG(FATAL) << "Could not find a free caller-save register";
    UNREACHABLE();
  }
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compiler/optimizing/code_generator_arm.cc [604:619]:
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  Register FindAvailableCallerSaveRegister(CodeGenerator* codegen) {
    size_t ref = static_cast<int>(ref_.AsRegister<Register>());
    size_t obj = static_cast<int>(obj_.AsRegister<Register>());
    for (size_t i = 0, e = codegen->GetNumberOfCoreRegisters(); i < e; ++i) {
      if (i != ref && i != obj && !codegen->IsCoreCalleeSaveRegister(i)) {
        return static_cast<Register>(i);
      }
    }
    // We shall never fail to find a free caller-save register, as
    // there are more than two core caller-save registers on ARM
    // (meaning it is possible to find one which is different from
    // `ref` and `obj`).
    DCHECK_GT(codegen->GetNumberOfCoreCallerSaveRegisters(), 2u);
    LOG(FATAL) << "Could not find a free caller-save register";
    UNREACHABLE();
  }
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