Add deoptimization history to optimized functions.

runtime/vm/flow_graph_inliner.cc

Index: runtime/vm/flow_graph_inliner.cc
===================================================================
--- runtime/vm/flow_graph_inliner.cc	(revision 23072)
+++ runtime/vm/flow_graph_inliner.cc	(working copy)
@@ -612,6 +612,14 @@
       // Add the function to the cache.
       if (!in_cache) function_cache_.Add(parsed_function);
 
+      // If not yet present, allocate deoptimization history array.
+      const Array& deopt_history = Array::Handle(function.deopt_history());
+      if (deopt_history.IsNull()) {
+        const Array& array =
+            Array::Handle(Array::New(FLAG_deoptimization_counter_threshold));
+        function.set_deopt_history(array);
+      }
+
       // Build succeeded so we restore the bailout jump.
       inlined_ = true;
       inlined_size_ += size;