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

src/stub-cache.h

Index: src/stub-cache.h
diff --git a/src/stub-cache.h b/src/stub-cache.h
index ebf0bd3c917b5e06ba80f0a4bedb5bd1703def23..07243f77e4aa0f69323b697f168c4b26b562465c 100644
--- a/src/stub-cache.h
+++ b/src/stub-cache.h
@@ -912,7 +912,11 @@ class CallStubCompiler: public StubCompiler {
 
   // Patch the global proxy over the global object if the global object is the
   // receiver.
-  void PatchGlobalProxy(Handle<Object> object);
+  static void FetchGlobalProxy(MacroAssembler* masm,
+                               Register function,
+                               Register target);
+  void PatchGlobalProxy(Handle<Object> object, Register function);
+  void PatchGlobalProxy(Handle<Object> object, Handle<JSFunction> function);
 
   // Returns the register containing the holder of |name|.
   Register HandlerFrontendHeader(Handle<Object> object,