Revert of Implement .eh_frame writer and disassembler.

src/arm64/eh-frame-arm64.cc

-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/eh-frame.h"
-
-namespace v8 {
-namespace internal {
-
-static const int kX0DwarfCode = 0;
-static const int kJsSpDwarfCode = 28;
-static const int kFpDwarfCode = 29;
-static const int kLrDwarfCode = 30;
-static const int kCSpDwarfCode = 31;
-
-STATIC_CONST_MEMBER_DEFINITION const int
-    EhFrameConstants::kCodeAlignmentFactor = 4;
-
-STATIC_CONST_MEMBER_DEFINITION const int
-    EhFrameConstants::kDataAlignmentFactor = -8;
-
-void EhFrameWriter::WriteReturnAddressRegisterCode() {
-  WriteULeb128(kLrDwarfCode);
-}
-
-void EhFrameWriter::WriteInitialStateInCie() {
-  SetBaseAddressRegisterAndOffset(x29, 0);
-  RecordRegisterNotModified(x30);
-}
-
-// static
-int EhFrameWriter::RegisterToDwarfCode(Register name) {
-  switch (name.code()) {
-    case Register::kCode_x28:
-      return kJsSpDwarfCode;
-    case Register::kCode_x29:
-      return kFpDwarfCode;
-    case Register::kCode_x30:
-      return kLrDwarfCode;
-    case Register::kCode_x31:
-      return kCSpDwarfCode;
-    case Register::kCode_x0:
-      return kX0DwarfCode;
-    default:
-      UNIMPLEMENTED();
-      return -1;
-  }
-}
-
-#ifdef ENABLE_DISASSEMBLER
-
-// static
-const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) {
-  switch (code) {
-    case kFpDwarfCode:
-      return "fp";
-    case kLrDwarfCode:
-      return "lr";
-    case kJsSpDwarfCode:
-      return "jssp";
-    case kCSpDwarfCode:
-      return "csp";  // This could be zr as well
-    default:
-      UNIMPLEMENTED();
-      return nullptr;
-  }
-}
-
-#endif
-
-}  // namespace internal
-}  // namespace v8