Remember to update the write barrier when storing into...

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
===================================================================
--- src/ia32/full-codegen-ia32.cc	(revision 3745)
+++ src/ia32/full-codegen-ia32.cc	(working copy)
@@ -94,8 +94,14 @@
                                (num_parameters - 1 - i) * kPointerSize;
         // Load parameter from stack.
         __ mov(eax, Operand(ebp, parameter_offset));
-        // Store it in the context
-        __ mov(Operand(esi, Context::SlotOffset(slot->index())), eax);
+        // Store it in the context.
+        int context_offset = Context::SlotOffset(slot->index());
+        __ mov(Operand(esi, context_offset), eax);
+        // Update the write barrier. This clobbers all involved
+        // registers, so we have use a third register to avoid
+        // clobbering esi.
+        __ mov(ecx, esi);
+        __ RecordWrite(ecx, context_offset, eax, ebx);
       }
     }
   }
@@ -111,7 +117,7 @@
     }
     // Receiver is just before the parameters on the caller's stack.
     __ lea(edx, Operand(ebp, StandardFrameConstants::kCallerSPOffset +
-                                 fun->num_parameters() * kPointerSize));
+                        fun->num_parameters() * kPointerSize));
     __ push(edx);
     __ push(Immediate(Smi::FromInt(fun->num_parameters())));
     // Arguments to ArgumentsAccessStub: