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

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
diff --git a/runtime/vm/intermediate_language.h b/runtime/vm/intermediate_language.h
index 731fecafea9e5ff468c11fafe74c19b467a1ec55..3dbf5b6e4e0634fd0b0de7f33cdb5894f681bb0b 100644
--- a/runtime/vm/intermediate_language.h
+++ b/runtime/vm/intermediate_language.h
@@ -1558,12 +1558,14 @@ class CatchBlockEntryInstr : public BlockEntryInstr {
  public:
   CatchBlockEntryInstr(intptr_t block_id,
                        intptr_t try_index,
+                       GraphEntryInstr* graph_entry,
                        const Array& handler_types,
                        intptr_t catch_try_index,
                        const LocalVariable& exception_var,
                        const LocalVariable& stacktrace_var,
                        bool needs_stacktrace)
       : BlockEntryInstr(block_id, try_index),
+        graph_entry_(graph_entry),
         predecessor_(NULL),
         catch_handler_types_(Array::ZoneHandle(handler_types.raw())),
         catch_try_index_(catch_try_index),
@@ -1581,6 +1583,8 @@ class CatchBlockEntryInstr : public BlockEntryInstr {
     return predecessor_;
   }
 
+  GraphEntryInstr* graph_entry() const { return graph_entry_; }
+
   const LocalVariable& exception_var() const { return exception_var_; }
   const LocalVariable& stacktrace_var() const { return stacktrace_var_; }
 
@@ -1606,6 +1610,7 @@ class CatchBlockEntryInstr : public BlockEntryInstr {
     predecessor_ = predecessor;
   }
 
+  GraphEntryInstr* graph_entry_;
   BlockEntryInstr* predecessor_;
   const Array& catch_handler_types_;
   const intptr_t catch_try_index_;