Load the global proxy from the context of the target function.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index df8d2dcb61d54a4a9d3c5cbb15c3387878394512..73b9976294fc0c1ecc4704fa1bb4acad5b60aea3 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -2399,7 +2399,8 @@ class HCallNamed V8_FINAL : public HUnaryCall {
 
 enum CallMode {
   NORMAL_CALL,
-  TAIL_CALL
+  TAIL_CALL,
+  NORMAL_CONTEXTUAL_CALL
 };
 
 
@@ -2410,7 +2411,7 @@ class HCallFunction V8_FINAL : public HBinaryCall {
       HCallFunction, HValue*, int, CallMode);
 
   bool IsTailCall() const { return call_mode_ == TAIL_CALL; }
-
+  bool IsContextualCall() const { return call_mode_ == NORMAL_CONTEXTUAL_CALL; }
   HValue* context() { return first(); }
   HValue* function() { return second(); }