Hydrogen support for context allocated harmony bindings.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 08868f536223572d716ab69c0b6b6acf09961830..f405e330d90c029ea3a02b8c957b26f0b1b56d37 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -2317,6 +2317,11 @@ void LCodeGen::DoLoadContextSlot(LLoadContextSlot* instr) {
   Register context = ToRegister(instr->context());
   Register result = ToRegister(instr->result());
   __ ldr(result, ContextOperand(context, instr->slot_index()));
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+    __ cmp(result, ip);
+    DeoptimizeIf(eq, instr->environment());
+  }
 }
 
 
@@ -2324,6 +2329,13 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
   Register context = ToRegister(instr->context());
   Register value = ToRegister(instr->value());
   MemOperand target = ContextOperand(context, instr->slot_index());
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    Register scratch = scratch0();
+    __ ldr(scratch, target);
+    __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+    __ cmp(scratch, ip);
+    DeoptimizeIf(eq, instr->environment());
+  }
   __ str(value, target);
   if (instr->hydrogen()->NeedsWriteBarrier()) {
     HType type = instr->hydrogen()->value()->type();