Fix for issue 4848 (Added missing store buffer updates when storing an object reference into anothe…

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 11629)
+++ runtime/vm/object.cc	(working copy)
@@ -3465,8 +3465,7 @@
 
 void TypeArguments::SetTypeAt(intptr_t index, const AbstractType& value) const {
   ASSERT(!IsCanonical());
-  // TODO(iposva): Add storing NoGCScope.
-  *TypeAddr(index) = value.raw();
+  StorePointer(TypeAddr(index), value.raw());
 }
 
 
@@ -7449,7 +7448,7 @@
 
 
 void ContextScope::SetNameAt(intptr_t scope_index, const String& name) const {
-  VariableDescAddr(scope_index)->name = name.raw();
+  StorePointer(&(VariableDescAddr(scope_index)->name), name.raw());
 }
 
 
@@ -7470,7 +7469,7 @@
 
 void ContextScope::SetTypeAt(
     intptr_t scope_index, const AbstractType& type) const {
-  VariableDescAddr(scope_index)->type = type.raw();
+  StorePointer(&(VariableDescAddr(scope_index)->type), type.raw());
 }