Emit assembly instead of a blob for the instructions snapshot, and provide labels for the entry poi…

runtime/vm/raw_object_snapshot.cc

Index: runtime/vm/raw_object_snapshot.cc
diff --git a/runtime/vm/raw_object_snapshot.cc b/runtime/vm/raw_object_snapshot.cc
index ff8c43835f8ea102fe00c685e698efa15a01678b..ffbfd63dfe841183ac17f18171bc0452c1440065 100644
--- a/runtime/vm/raw_object_snapshot.cc
+++ b/runtime/vm/raw_object_snapshot.cc
@@ -1180,6 +1180,8 @@ void RawCode::WriteTo(SnapshotWriter* writer,
   // Write out all the object pointer fields.
   SnapshotWriterVisitor visitor(writer);
   visitor.VisitPointers(from(), to());
+
+  writer->SetInstructionsCode(ptr()->instructions_, this);
 }