PATCH (not to be comitted): Support for printing instruction statistics

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
diff --git a/runtime/vm/raw_object.h b/runtime/vm/raw_object.h
index 532cb72b7038a4d5b65fbae1a6f1f14bd3740c25..c6c26c9af0aec2ba8da13d335ef559aaa0d33a4a 100644
--- a/runtime/vm/raw_object.h
+++ b/runtime/vm/raw_object.h
@@ -1075,6 +1075,7 @@ class RawNamespace : public RawObject {
 };
 
 
+class CodeStatistics;
 class RawCode : public RawObject {
   enum InlinedMetadataIndex {
     kInlinedIntervalsIndex = 0,
@@ -1120,6 +1121,10 @@ class RawCode : public RawObject {
 #endif
   }
 
+#ifdef DART_PRECOMPILER
+  CodeStatistics* function_stats_;
+#endif
+
   // Compilation timestamp.
   NOT_IN_PRECOMPILED(int64_t compile_timestamp_);