DWARF and unwind support for AOT assembly output.

runtime/vm/clustered_snapshot.cc

Index: runtime/vm/clustered_snapshot.cc
diff --git a/runtime/vm/clustered_snapshot.cc b/runtime/vm/clustered_snapshot.cc
index 3bd1c6ce9d3db287e5abbea9015a6f77f32c8da4..6b28d7d4cf064b1e159c136f7eac18d2cafa1fff 100644
--- a/runtime/vm/clustered_snapshot.cc
+++ b/runtime/vm/clustered_snapshot.cc
@@ -1567,8 +1567,10 @@ class CodeSerializationCluster : public SerializationCluster {
     s->Push(code->ptr()->exception_handlers_);
     s->Push(code->ptr()->pc_descriptors_);
     s->Push(code->ptr()->stackmaps_);
-    s->Push(code->ptr()->inlined_id_to_function_);
-    s->Push(code->ptr()->code_source_map_);
+    if (!FLAG_dwarf_stack_traces) {
+      s->Push(code->ptr()->inlined_id_to_function_);
+      s->Push(code->ptr()->code_source_map_);
+    }
 
     if (s->kind() == Snapshot::kAppJIT) {
       s->Push(code->ptr()->deopt_info_array_);
@@ -1621,8 +1623,13 @@ class CodeSerializationCluster : public SerializationCluster {
       s->WriteRef(code->ptr()->exception_handlers_);
       s->WriteRef(code->ptr()->pc_descriptors_);
       s->WriteRef(code->ptr()->stackmaps_);
-      s->WriteRef(code->ptr()->inlined_id_to_function_);
-      s->WriteRef(code->ptr()->code_source_map_);
+      if (FLAG_dwarf_stack_traces) {
+        s->WriteRef(Array::null());
+        s->WriteRef(CodeSourceMap::null());
+      } else {
+        s->WriteRef(code->ptr()->inlined_id_to_function_);
+        s->WriteRef(code->ptr()->code_source_map_);
+      }
 
       if (s->kind() == Snapshot::kAppJIT) {
         s->WriteRef(code->ptr()->deopt_info_array_);