Await always waits

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 40935)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -666,8 +666,8 @@
     ASSERT(instr == NULL || !instr->IsBlockEntry());
     // TODO(fschneider): Also add Throw and ReThrow to the list of instructions
     // that do not have a successor. Currently, the graph builder will continue
-    // to append instruction in case of a Throw inside an expression. This
-    // condition should be handled in the graph builder
+    // to append instructions in case of a Throw inside an expression. This
+    // condition should be handled in the graph builder.
     next_ = instr;
   }
 
@@ -1365,6 +1365,12 @@
     return catch_entries_;
   }
 
+  intptr_t next_await_counter() { return jump_cnt_++; }
+  ZoneGrowableArray<intptr_t>& await_levels() { return await_levels_; }
+  ZoneGrowableArray<JoinEntryInstr*>& await_joins() {
+    return await_joins_;
+  }
+
   virtual void PrintTo(BufferFormatter* f) const;
 
  private:
@@ -1380,6 +1386,10 @@
   intptr_t spill_slot_count_;
   intptr_t fixed_slot_count_;  // For try-catch in optimized code.
 
+  intptr_t jump_cnt_;
+  ZoneGrowableArray<JoinEntryInstr*> await_joins_;
+  ZoneGrowableArray<intptr_t> await_levels_;
+
   DISALLOW_COPY_AND_ASSIGN(GraphEntryInstr);
 };