Revert of Reland Implement .eh_frame writer and disassembler.

src/x64/eh-frame-x64.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 kRaxDwarfCode = 0;
-static const int kRbpDwarfCode = 6;
-static const int kRspDwarfCode = 7;
-static const int kRipDwarfCode = 16;
-
-STATIC_CONST_MEMBER_DEFINITION const int
-    EhFrameConstants::kCodeAlignmentFactor = 1;
-
-STATIC_CONST_MEMBER_DEFINITION const int
-    EhFrameConstants::kDataAlignmentFactor = -8;
-
-void EhFrameWriter::WriteReturnAddressRegisterCode() {
-  WriteULeb128(kRipDwarfCode);
-}
-
-void EhFrameWriter::WriteInitialStateInCie() {
-  SetBaseAddressRegisterAndOffset(rsp, kPointerSize);
-  // x64 rip (r16) has no Register instance associated.
-  RecordRegisterSavedToStack(kRipDwarfCode, -kPointerSize);
-}
-
-// static
-int EhFrameWriter::RegisterToDwarfCode(Register name) {
-  switch (name.code()) {
-    case Register::kCode_rbp:
-      return kRbpDwarfCode;
-    case Register::kCode_rsp:
-      return kRspDwarfCode;
-    case Register::kCode_rax:
-      return kRaxDwarfCode;
-    default:
-      UNIMPLEMENTED();
-      return -1;
-  }
-}
-
-#ifdef ENABLE_DISASSEMBLER
-
-// static
-const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) {
-  switch (code) {
-    case kRbpDwarfCode:
-      return "rbp";
-    case kRspDwarfCode:
-      return "rsp";
-    case kRipDwarfCode:
-      return "rip";
-    default:
-      UNIMPLEMENTED();
-      return nullptr;
-  }
-}
-
-#endif
-
-}  // namespace internal
-}  // namespace v8