Strict mode arguments do not share binding with formal parameters.

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 9a7d41ada25f2117859ca644b12d9a5dcc95c946..608aebe69db5913d5d5701ef3757c31b9e239791 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -199,10 +199,13 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
     // stack frame was an arguments adapter frame.
     ArgumentsAccessStub stub(ArgumentsAccessStub::NEW_OBJECT);
     __ CallStub(&stub);
-    __ mov(ecx, eax);  // Duplicate result.
+
+    Variable* arguments_shadow = scope()->arguments_shadow();
+    if (arguments_shadow != NULL) {
+      __ mov(ecx, eax);  // Duplicate result.
+      Move(arguments_shadow->AsSlot(), ecx, ebx, edx);
+    }
     Move(arguments->AsSlot(), eax, ebx, edx);
-    Slot* dot_arguments_slot = scope()->arguments_shadow()->AsSlot();
-    Move(dot_arguments_slot, ecx, ebx, edx);
   }
 
   if (FLAG_trace) {