Write barrier for storing a code entry, and usage in CompileLazy builtin.

src/ia32/builtins-ia32.cc

Index: src/ia32/builtins-ia32.cc
diff --git a/src/ia32/builtins-ia32.cc b/src/ia32/builtins-ia32.cc
index a7a88ceeeae02da80c50a589aee3ba63200ea692..b9b67ab05b74331ecc3515806828b252408c761a 100644
--- a/src/ia32/builtins-ia32.cc
+++ b/src/ia32/builtins-ia32.cc
@@ -941,6 +941,8 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   Label install_optimized_code_and_tailcall;
   __ bind(&install_optimized_code_and_tailcall);
   __ mov(FieldOperand(closure, JSFunction::kCodeEntryOffset), entry);
+  __ mov(ebx, entry);
+  __ RecordWriteCodeEntryField(closure, ebx, eax);
 
   // Link the closure into the optimized function list.
   // ecx : code entry
@@ -997,6 +999,8 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   // Yes, install the full code.
   __ lea(entry, FieldOperand(entry, Code::kHeaderSize));
   __ mov(FieldOperand(closure, JSFunction::kCodeEntryOffset), entry);
+  __ mov(ebx, entry);
+  __ RecordWriteCodeEntryField(closure, ebx, eax);
   __ jmp(entry);
 
   __ bind(&gotta_call_runtime);