Implement ClearFunctionTypeFeedback for test cases.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 1305f8b5c813ff1a5d814d2c8d73609170684c2c..0b80effbf21e86138f7e66ea6290998d3922b7de 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -8277,6 +8277,19 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeoptimizeFunction) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_ClearFunctionTypeFeedback) {
+  HandleScope scope(isolate);
+  ASSERT(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
+  Code* unoptimized = function->shared()->code();
+  if (unoptimized->kind() == Code::FUNCTION) {
+    unoptimized->ClearInlineCaches();
+    unoptimized->ClearTypeFeedbackCells(isolate->heap());
+  }
+  return isolate->heap()->undefined_value();
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_RunningInSimulator) {
 #if defined(USE_SIMULATOR)
   return isolate->heap()->true_value();