- Remember objects (not addresses) in the old generation containing new pointers.

runtime/vm/assembler_ia32.cc

Index: runtime/vm/assembler_ia32.cc
===================================================================
--- runtime/vm/assembler_ia32.cc	(revision 20732)
+++ runtime/vm/assembler_ia32.cc	(working copy)
@@ -1890,6 +1890,7 @@
 }
 
 
+// Destroys the value register.
 void Assembler::StoreIntoObject(Register object,
                                 const Address& dest,
                                 Register value,
@@ -1905,7 +1906,9 @@
   }
   // A store buffer update is required.
   if (value != EAX) pushl(EAX);  // Preserve EAX.
-  leal(EAX, dest);
+  if (object != EAX) {
+    movl(EAX, object);
+  }
   call(&StubCode::UpdateStoreBufferLabel());
   if (value != EAX) popl(EAX);  // Restore EAX.
   Bind(&done);