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 2ec9afca87df686b3ee069baa46b2b2c1aa21ffb..00a05a828fffcea49a63594cb749b312df2df979 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -60,6 +60,7 @@
 #ifdef ENABLE_DISASSEMBLER
 #include "src/disasm.h"
 #include "src/disassembler.h"
+#include "src/eh-frame.h"
 #endif
 
 namespace v8 {
@@ -14355,6 +14356,13 @@ 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";
+    EhFrameWriter::DisassembleToStream(os, unwinding_info_start(),
+                                       unwinding_info_end());
+    os << "\n";
+  }
 }
 #endif  // ENABLE_DISASSEMBLER