Reland Implement .eh_frame writer and disassembler.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 9f7524ccefb7a4dc85ae9ee1677840b14e8d1bad..38ea65e176a78bf9eead05a0e0db2afc221574ed 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -61,6 +61,7 @@
 #ifdef ENABLE_DISASSEMBLER
 #include "src/disasm.h"
 #include "src/disassembler.h"
+#include "src/eh-frame.h"
 #endif
 
 namespace v8 {
@@ -14418,6 +14419,14 @@ void Code::Disassemble(const char* name, std::ostream& os) {  // NOLINT
     it.rinfo()->Print(GetIsolate(), os);
   }
   os << "\n";
+
+  if (has_unwinding_info()) {
+    os << "UnwindingInfo (size = " << unwinding_info_size() << ")\n";
+    EhFrameDisassembler eh_frame_disassembler(unwinding_info_start(),
+                                              unwinding_info_end());
+    eh_frame_disassembler.DisassembleToStream(os);
+    os << "\n";
+  }
 }
 #endif  // ENABLE_DISASSEMBLER