Track the 'awaiter return' call stack use it to detect uncaught exceptions in async functions

runtime/vm/code_descriptors.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/code_descriptors.h"
 
 #include "vm/log.h"
 
 namespace dart {
 
@@ skipping 84 matching lines @@
   for (intptr_t i = 0; i < num_handlers; i++) {
     // Assert that every element in the array has been initialized.
     if (list_[i].handler_types == NULL) {
       // Unreachable handler, entry not computed.
       // Initialize it to some meaningful value.
       const bool has_catch_all = false;
       // Check it is uninitialized.
       ASSERT((list_[i].outer_try_index == -1) &&
              (list_[i].pc_offset == ExceptionHandlers::kInvalidPcOffset));
       handlers.SetHandlerInfo(i, list_[i].outer_try_index, list_[i].pc_offset,
-                              list_[i].needs_stacktrace, has_catch_all);
+                              list_[i].needs_stacktrace, has_catch_all,
+                              list_[i].token_pos, list_[i].is_generated);
       handlers.SetHandledTypes(i, Array::empty_array());
     } else {
       const bool has_catch_all = ContainsDynamic(*list_[i].handler_types);
       handlers.SetHandlerInfo(i, list_[i].outer_try_index, list_[i].pc_offset,
-                              list_[i].needs_stacktrace, has_catch_all);
+                              list_[i].needs_stacktrace, has_catch_all,
+                              list_[i].token_pos, list_[i].is_generated);
       handlers.SetHandledTypes(i, *list_[i].handler_types);
     }
   }
   return handlers.raw();
 }
 
 
 static uint8_t* zone_allocator(uint8_t* ptr,
                                intptr_t old_size,
                                intptr_t new_size) {
@@ skipping 420 matching lines @@
         break;
       }
       default:
         UNREACHABLE();
     }
   }
   THR_Print("}\n");
 }
 
 }  // namespace dart