Initial support for emitting unwinding information in perf jitdump.

test/cctest/test-reloc-info.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 50 matching lines @@
     } else {
       printf("TEST WRITING POSITION %p %d\n", static_cast<void*>(pc), pos);
     }
     WriteRinfo(&writer, pc, mode, pos);
     CHECK(writer.pos() - RelocInfoWriter::kMaxSize >= relocation_info_end);
   }
 
   writer.Finish();
   relocation_info_size = static_cast<int>(buffer_end - writer.pos());
   MacroAssembler assm(CcTest::i_isolate(), nullptr, 0, CodeObjectRequired::kNo);
-  CodeDesc desc = {buffer.get(),         buffer_size, code_size,
-                   relocation_info_size, 0,           &assm};
+  CodeDesc desc = {
+      buffer.get(), buffer_size, code_size, relocation_info_size, 0,
+      nullptr,      0,           &assm};
 
   // Read only (non-statement) positions.
   {
     RelocIterator it(desc, RelocInfo::ModeMask(RelocInfo::POSITION));
     pc = buffer.get();
     for (int i = 0, pos = 0; i < 100; i++, pc += i, pos += i) {
       printf("TESTING 1: %d\n", i);
       RelocInfo::Mode mode = (i % 2 == 0) ?
           RelocInfo::STATEMENT_POSITION : RelocInfo::POSITION;
       if (mode == RelocInfo::POSITION) {
@@ skipping 34 matching lines @@
       CHECK_EQ(mode, it.rinfo()->rmode());
       CHECK_EQ(pos, static_cast<int>(it.rinfo()->data()));
       it.next();
     }
     CHECK(it.done());
   }
 }
 
 }  // namespace internal
 }  // namespace v8