Reland Implement .eh_frame writer and disassembler.

src/arm/eh-frame-arm.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/arm/eh-frame-arm.h"
+
+namespace v8 {
+namespace internal {
+
+const char* GetRegisterName(int register_number) {

[rmcilroy, 2016/06/28 10:37:32]

Just use Register::from_code(i).ToString() and delete this function.

[Stefano Sanfilippo, 2016/06/29 15:16:20]

Register::ToString() appears to show all register as rX or aX, though. I think
having the aliases makes the disassembly more readable.

+  switch (register_number) {
+    case 7:
+      return "cp";
+    case 8:
+      return "pp";
+    case 11:
+      return "fp";
+    case 12:
+      return "ip";
+    case 13:
+      return "sp";
+    case 14:
+      return "lr";
+    case 15:
+      return "pc";
+    default:
+      UNIMPLEMENTED();
+      return nullptr;
+  }
+}
+
+}  // namespace internal
+}  // namespace v8