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

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 9e1d5032bca59832bfe0ddd400c7fde1e3f4c3fd..48e62882e1f97c037d2cdc73cd519be3ba3efafe 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -8444,12 +8444,10 @@ class StackTrace : public Instance {
                             const StackTrace& async_link,
                             Heap::Space space = Heap::kNew);
 
-  // The argument 'max_frames' limits the number of printed frames.
-  static const char* ToCStringInternal(const StackTrace& stack_trace,
-                                       intptr_t* frame_index,
-                                       intptr_t max_frames = kMaxInt32);
-
  private:
+  static const char* ToDartCString(const StackTrace& stack_trace_in);
+  static const char* ToDwarfCString(const StackTrace& stack_trace_in);
+
   void set_code_array(const Array& code_array) const;
   void set_pc_offset_array(const Array& pc_offset_array) const;
   bool expand_inlined() const;