DWARF and unwind support for AOT assembly output.

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index f8db6b46f4e2130457dfdde4edb24ce1dcbc7451..974e9095ec68a29fce2917e7b905337a62730eac 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -6706,6 +6706,11 @@ Dart_CreateAppAOTSnapshotAsBlobs(uint8_t** vm_snapshot_data_buffer,
   return Api::NewError(
       "This VM was built without support for AOT compilation.");
 #else
+  if (FLAG_dwarf_stack_traces) {
+    return Api::NewError(
+        "--dwarf_stack_traces requires creating an AOT snapshot as assembly.");
+  }
+
   API_TIMELINE_DURATION;
   DARTSCOPE(Thread::Current());
   Isolate* I = T->isolate();