Support load function prototype in hydrogen/lithium.

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 895ab67713b3fc8830701e16a915d7c23c3f0c17..1a6e7681cf4422aebe6087aadc9b3858596ef8ff 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -517,6 +517,9 @@ void Property::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
   if (key()->IsPropertyName()) {
     if (oracle->LoadIsBuiltin(this, Builtins::LoadIC_ArrayLength)) {
       is_array_length_ = true;
+    } else if (oracle->LoadIsBuiltin(this,
+                                     Builtins::LoadIC_FunctionPrototype)) {
+      is_function_prototype_ = true;
     } else {
       Literal* lit_key = key()->AsLiteral();
       ASSERT(lit_key != NULL && lit_key->handle()->IsString());