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

runtime/vm/native_symbol_linux.cc

Index: runtime/vm/native_symbol_linux.cc
diff --git a/runtime/vm/native_symbol_linux.cc b/runtime/vm/native_symbol_linux.cc
index 4afcb4b716b493f9cc99947a0b8b5254b84b5ff6..d5df815459f99605a2852a542a76dbb0ecc7f51c 100644
--- a/runtime/vm/native_symbol_linux.cc
+++ b/runtime/vm/native_symbol_linux.cc
@@ -47,19 +47,6 @@ void NativeSymbolResolver::FreeSymbolName(char* 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_LINUX)