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

src/x64/stub-cache-x64.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 1206 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.
   __ movq(rdx, Operand(rsp, (argc + 1) * 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(rdx, miss);
-  }
 
   // Check that the maps haven't changed.
+  __ JumpIfSmi(rdx, miss);
   CheckPrototypes(object, rdx, holder, rbx, rax, rdi, name, miss);
 }
 
 
 void CallStubCompiler::GenerateLoadFunctionFromCell(
     Handle<JSGlobalPropertyCell> cell,
     Handle<JSFunction> function,
     Label* miss) {
   // Get the value from the cell.
   __ Move(rdi, cell);
@@ skipping 1413 matching lines @@
     Handle<JSGlobalPropertyCell> cell,
     Handle<String> name,
     bool is_dont_delete) {
   // ----------- S t a t e -------------
   //  -- rax    : receiver
   //  -- rcx    : name
   //  -- rsp[0] : 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 loads. In this case,
-  // the receiver cannot be a smi.
-  if (!object.is_identical_to(holder)) {
-    __ JumpIfSmi(rax, &miss);
-  }
-
   // Check that the maps haven't changed.
+  __ JumpIfSmi(rax, &miss);
   CheckPrototypes(object, rax, holder, rbx, rdx, rdi, name, &miss);
 
   // Get the value from the cell.
   __ Move(rbx, cell);
   __ movq(rbx, FieldOperand(rbx, JSGlobalPropertyCell::kValueOffset));
 
   // Check for deleted property if property can actually be deleted.
   if (!is_dont_delete) {
     __ CompareRoot(rbx, Heap::kTheHoleValueRootIndex);
     __ j(equal, &miss);
@@ skipping 1111 matching lines @@
     __ jmp(ic_slow, RelocInfo::CODE_TARGET);
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64