Ensure there is a smi check of the receiver for global load and call ICs.

src/mips/stub-cache-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1376 matching lines @@
                                                    Handle<String> name,
                                                    Label* miss) {
   ASSERT(holder->IsGlobalObject());
 
   // Get the number of arguments.
   const int argc = arguments().immediate();
 
   // Get the receiver from the stack.
   __ lw(a0, MemOperand(sp, argc * kPointerSize));
 
-  // If the object is the holder then we know that it's a global
-  // object which can only happen for contextual calls. In this case,
-  // the receiver cannot be a smi.
-  if (!object.is_identical_to(holder)) {
-    __ JumpIfSmi(a0, miss);
-  }
-
   // Check that the maps haven't changed.
+  __ JumpIfSmi(a0, miss);
   CheckPrototypes(object, a0, holder, a3, a1, t0, name, miss);
 }
 
 
 void CallStubCompiler::GenerateLoadFunctionFromCell(
     Handle<JSGlobalPropertyCell> cell,
     Handle<JSFunction> function,
     Label* miss) {
   // Get the value from the cell.
   __ li(a3, Operand(cell));
@@ skipping 1397 matching lines @@
     Handle<JSGlobalPropertyCell> cell,
     Handle<String> name,
     bool is_dont_delete) {
   // ----------- S t a t e -------------
   //  -- a0    : receiver
   //  -- a2    : name
   //  -- ra    : return address
   // -----------------------------------
   Label miss;
 
-  // If the object is the holder then we know that it's a global
-  // object which can only happen for contextual calls. In this case,
-  // the receiver cannot be a smi.
-  if (!object.is_identical_to(holder)) {
-    __ JumpIfSmi(a0, &miss);
-  }
-
   // Check that the map of the global has not changed.
+  __ JumpIfSmi(a0, &miss);
   CheckPrototypes(object, a0, holder, a3, t0, a1, name, &miss);
 
   // Get the value from the cell.
   __ li(a3, Operand(cell));
   __ lw(t0, FieldMemOperand(a3, JSGlobalPropertyCell::kValueOffset));
 
   // Check for deleted property if property can actually be deleted.
   if (!is_dont_delete) {
     __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
     __ Branch(&miss, eq, t0, Operand(at));
@@ skipping 1681 matching lines @@
     __ Jump(ic_slow, RelocInfo::CODE_TARGET);
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS