Crankshaft part of the 'loads and stores to global vars through property cell shortcuts' feature.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 55e501762c4fece70a9264ac24068dcad39dc37b..2d72687d31c77c25cb6a39869cbcf0731e635bc0 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -330,6 +330,12 @@ void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
 }
 
 
+void LLoadGlobalViaContext::PrintDataTo(StringStream* stream) {
+  stream->Add(String::cast(*name())->ToCString().get());
+  stream->Add(" depth:%d slot:%d", depth(), slot_index());
+}
+
+
 void LStoreNamedField::PrintDataTo(StringStream* stream) {
   object()->PrintTo(stream);
   std::ostringstream os;
@@ -348,6 +354,14 @@ void LStoreNamedGeneric::PrintDataTo(StringStream* stream) {
 }
 
 
+void LStoreGlobalViaContext::PrintDataTo(StringStream* stream) {
+  stream->Add(String::cast(*name())->ToCString().get());
+  stream->Add(" <- ");
+  value()->PrintTo(stream);
+  stream->Add(" depth:%d slot:%d", depth(), slot_index());
+}
+
+
 void LLoadKeyed::PrintDataTo(StringStream* stream) {
   elements()->PrintTo(stream);
   stream->Add("[");
@@ -2150,6 +2164,15 @@ LInstruction* LChunkBuilder::DoLoadGlobalGeneric(HLoadGlobalGeneric* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoLoadGlobalViaContext(
+    HLoadGlobalViaContext* instr) {
+  LOperand* context = UseFixed(instr->context(), cp);
+  DCHECK(instr->slot_index() > 0);
+  LLoadGlobalViaContext* result = new (zone()) LLoadGlobalViaContext(context);
+  return MarkAsCall(DefineFixed(result, r0), instr);
+}
+
+
 LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
   LOperand* context = UseRegisterAtStart(instr->value());
   LInstruction* result =
@@ -2437,6 +2460,19 @@ LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoStoreGlobalViaContext(
+    HStoreGlobalViaContext* instr) {
+  LOperand* context = UseFixed(instr->context(), cp);
+  LOperand* value = UseFixed(instr->value(),
+                             StoreGlobalViaContextDescriptor::ValueRegister());
+  DCHECK(instr->slot_index() > 0);
+
+  LStoreGlobalViaContext* result =
+      new (zone()) LStoreGlobalViaContext(context, value);
+  return MarkAsCall(result, instr);
+}
+
+
 LInstruction* LChunkBuilder::DoStringAdd(HStringAdd* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
   LOperand* left = UseFixed(instr->left(), r1);