Support loading constant functions in hydrogen.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 9ca26a6a59f00298013b52e182f7a903084d2412..32108dc1cde6e819bd1e1ada105fc9cebc4a8e9d 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -3614,6 +3614,11 @@ HInstruction* HGraphBuilder::BuildLoadNamed(HValue* obj,
                                map,
                                &lookup,
                                true);
+  } else if (lookup.IsProperty() && lookup.type() == CONSTANT_FUNCTION) {
+    AddInstruction(new HCheckNonSmi(obj));
+    AddInstruction(new HCheckMap(obj, map));
+    Handle<JSFunction> function(lookup.GetConstantFunctionFromMap(*map));
+    return new HConstant(function, Representation::Tagged());
   } else {
     return BuildLoadNamedGeneric(obj, expr);
   }