VM: Fix receiver type propagation in presence of try-catch.

runtime/vm/flow_graph_builder.h

 // 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.
 
 #ifndef VM_FLOW_GRAPH_BUILDER_H_
 #define VM_FLOW_GRAPH_BUILDER_H_
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "vm/allocation.h"
@@ skipping 122 matching lines @@
   intptr_t catch_try_index() const { return catch_try_index_; }
 
   intptr_t next_await_counter() { return jump_count_++; }
 
   ZoneGrowableArray<JoinEntryInstr*>* await_joins() const {
     return await_joins_;
   }
 
   void AddCatchEntry(CatchBlockEntryInstr* entry);
 
+  GraphEntryInstr* graph_entry() const {
+    return graph_entry_;
+  }
+
   intptr_t num_copied_params() const {
     return num_copied_params_;
   }
   intptr_t num_non_copied_params() const {
     return num_non_copied_params_;
   }
   intptr_t num_stack_locals() const {
     return num_stack_locals_;
   }
 
@@ skipping 422 matching lines @@
   // Output parameters.
   GrowableArray<TargetEntryInstr**> true_successor_addresses_;
   GrowableArray<TargetEntryInstr**> false_successor_addresses_;
 
   TokenPosition condition_token_pos_;
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_BUILDER_H_