harmony-scoping: Implement StoreIC handler for stores to global contexts.

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index 225e00f5a49daf4ddebd84734bbc0946b5891661..e33b4a8438eaafcc8baccb0e533fcbab2dacab8f 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -518,13 +518,7 @@ HValue* CodeStubGraphBuilder<LoadGlobalContextFieldStub>::BuildCodeStub() {
   int context_index = casted_stub()->context_index();
   int slot_index = casted_stub()->slot_index();
 
-  HValue* native_context = BuildGetNativeContext();
-  HValue* global_context_table = Add<HLoadNamedField>(
-      native_context, static_cast<HValue*>(NULL),
-      HObjectAccess::ForContextSlot(Context::GLOBAL_CONTEXT_TABLE_INDEX));
-  HValue* global_context =
-      Add<HLoadNamedField>(global_context_table, static_cast<HValue*>(NULL),
-                           HObjectAccess::ForGlobalContext(context_index));
+  HValue* global_context = BuildGetGlobalContext(context_index);
   return Add<HLoadNamedField>(global_context, static_cast<HValue*>(NULL),
                               HObjectAccess::ForContextSlot(slot_index));
 }
@@ -536,6 +530,24 @@ Handle<Code> LoadGlobalContextFieldStub::GenerateCode() {
 
 
 template <>
+HValue* CodeStubGraphBuilder<StoreGlobalContextFieldStub>::BuildCodeStub() {
+  int context_index = casted_stub()->context_index();
+  int slot_index = casted_stub()->slot_index();
+
+  HValue* global_context = BuildGetGlobalContext(context_index);
+  Add<HStoreNamedField>(global_context,
+                        HObjectAccess::ForContextSlot(slot_index),
+                        GetParameter(2), STORE_TO_INITIALIZED_ENTRY);
+  return GetParameter(2);
+}
+
+
+Handle<Code> StoreGlobalContextFieldStub::GenerateCode() {
+  return DoGenerateCode(this);
+}
+
+
+template <>
 HValue* CodeStubGraphBuilder<LoadFastElementStub>::BuildCodeStub() {
   HInstruction* load = BuildUncheckedMonomorphicElementAccess(
       GetParameter(LoadDescriptor::kReceiverIndex),