MIPS: Fix loading the global receiver.

Port r18593 (2162d45)

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/137273006

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18600 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-codegen-mips.cc

@@ -3378,8 +3378,7 @@ void LCodeGen::DoWrapReceiver(LWrapReceiver* instr) {
   __ bind(&global_object);
   __ lw(receiver, FieldMemOperand(function, JSFunction::kContextOffset));
   __ lw(receiver,
-        ContextOperand(receiver,
-                       Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
+        ContextOperand(receiver, Context::GLOBAL_OBJECT_INDEX));
   __ lw(receiver,
         FieldMemOperand(receiver, GlobalObject::kGlobalReceiverOffset));