message: [ABI/SysV] Remove more dead code. NFCI.
diff: @@ -1161,48 +1161,6 @@ bool ABISysV_x86_64::PrepareTrivialCall(Thread &thread, addr_t sp,
  ProcessSP process_sp(thread.GetProcess());
  RegisterValue reg_value;
  -
  -#if 0
  - // This code adds an extra frame so that we don't lose the function that we came from
  - // by pushing the PC and the FP and then writing the current FP to point to the FP value
  - // we just pushed. It is disabled for now until the stack backtracing code can be debugged.
  -
  - // Save current PC
  - const RegisterInfo *fp_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FP);
  - if (reg_ctx->ReadRegister(pc_reg_info, reg_value))
  - {
  - if (log)
  - log->Printf("Pushing the current PC onto the stack: 0x%" PRIx64 ": 0x%" PRIx64, (uint64_t)sp, reg_value.GetAsUInt64());
  -
  - if (!process_sp->WritePointerToMemory(sp, reg_value.GetAsUInt64(), error))
  - return false;
  -
  - sp -= 8;
  -
  - // Save current FP
  - if (reg_ctx->ReadRegister(fp_reg_info, reg_value))
  - {
  - if (log)
  - log->Printf("Pushing the current FP onto the stack: 0x%" PRIx64 ": 0x%" PRIx64, (uint64_t)sp, reg_value.GetAsUInt64());
  -
  - if (!process_sp->WritePointerToMemory(sp, reg_value.GetAsUInt64(), error))
  - return false;
  - }
  - // Setup FP backchain
  - reg_value.SetUInt64 (sp);
  -
  - if (log)
  - log->Printf("Writing FP: 0x%" PRIx64 " (for FP backchain)", reg_value.GetAsUInt64());
  -
  - if (!reg_ctx->WriteRegister(fp_reg_info, reg_value))
  - {
  - return false;
  - }
  -
  - sp -= 8;
  - }
  -#endif
  -
  if (log)
  log->Printf("Pushing the return address onto the stack: 0x%" PRIx64
  ": 0x%" PRIx64,
  