Make _CallFunction proxy-aware.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 32292b625946a0c04f03c20854ef5eba17d31279..29938832cfe05fd88126fb7550f20b2ca88601cb 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1374,14 +1374,17 @@ class LCallNamed: public LTemplateInstruction<1, 0, 0> {
 };
 
 
-class LCallFunction: public LTemplateInstruction<1, 0, 0> {
+class LCallFunction: public LTemplateInstruction<1, 1, 0> {
  public:
-  LCallFunction() {}
+  explicit LCallFunction(LOperand* function) {
+    inputs_[0] = function;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CallFunction, "call-function")
   DECLARE_HYDROGEN_ACCESSOR(CallFunction)
 
-  int arity() const { return hydrogen()->argument_count() - 2; }
+  LOperand* function() { return inputs_[0]; }
+  int arity() const { return hydrogen()->argument_count() - 1; }
 };