Hydrogen support for context allocated harmony bindings.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index b486faec62f3aa0274df9f78ed47a563a79ab2c2..71f276e4340b79d45d1a91eee9a9747ef84884bb 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1786,7 +1786,8 @@ LInstruction* LChunkBuilder::DoStoreGlobalGeneric(HStoreGlobalGeneric* instr) {
 
 LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
   LOperand* context = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new LLoadContextSlot(context));
+  LInstruction* result = DefineAsRegister(new LLoadContextSlot(context));
+  return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
 }
 
 
@@ -1803,7 +1804,8 @@ LInstruction* LChunkBuilder::DoStoreContextSlot(HStoreContextSlot* instr) {
     value = UseRegister(instr->value());
     temp = NULL;
   }
-  return new LStoreContextSlot(context, value, temp);
+  LInstruction* result = new LStoreContextSlot(context, value, temp);
+  return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
 }