message: Before returning a pc value for a stack frame,
  run it through the ABI's FixCodeAddress method.
  <rdar://problem/29711506>
diff: @@ -2015,7 +2015,18 @@ bool RegisterContextLLDB::GetStartPC(addr_t &start_pc) {
  return false;
  if (!m_start_pc.IsValid()) {
  - return ReadPC(start_pc);
  + bool read_successfully = ReadPC (start_pc);
  + if (read_successfully)
  + {
  + ProcessSP process_sp (m_thread.GetProcess());
  + if (process_sp)
  + {
  + ABI *abi = process_sp->GetABI().get();
  + if (abi)
  + start_pc = abi->FixCodeAddress(start_pc);
  + }
  + }
  + return read_successfully;
  }
  start_pc = m_start_pc.GetLoadAddress(CalculateTarget().get());
  return true;
  @@ -2044,9 +2055,16 @@ bool RegisterContextLLDB::ReadPC(addr_t &pc) {
  if (m_all_registers_available == false && above_trap_handler == false &&
  (pc == 0 || pc == 1)) {
  return false;
  - } else {
  - return true;
  }
  +
  + ProcessSP process_sp (m_thread.GetProcess());
  + if (process_sp)
  + {
  + ABI *abi = process_sp->GetABI().get();
  + if (abi)
  + pc = abi->FixCodeAddress(pc);
  + }
  + return true;
  } else {
  return false;
  }
  