Revert "DWARF and unwind support for AOT assembly output."

runtime/vm/native_symbol_fuchsia.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(HOST_OS_FUCHSIA)
 
 #include "platform/memory_sanitizer.h"
 #include "vm/native_symbol.h"
 
@@ skipping 28 matching lines @@
     return demangled;
   }
   return strdup(info.dli_sname);
 }
 
 
 void NativeSymbolResolver::FreeSymbolName(char* name) {
   free(name);
 }
 
-
-bool NativeSymbolResolver::LookupSharedObject(uword pc,
-                                              uword* dso_base,
-                                              char** dso_name) {
-  Dl_info info;
-  int r = dladdr(reinterpret_cast<void*>(pc), &info);
-  if (r == 0) {
-    return false;
-  }
-  *dso_base = reinterpret_cast<uword>(info.dli_fbase);
-  *dso_name = strdup(info.dli_fname);
-  return true;
-}
-
 }  // namespace dart
 
 #endif  // defined(HOST_OS_FUCHSIA)