Revert remove dead hole check logic

src/crankshaft/mips/lithium-mips.cc

Index: src/crankshaft/mips/lithium-mips.cc
diff --git a/src/crankshaft/mips/lithium-mips.cc b/src/crankshaft/mips/lithium-mips.cc
index 544b6612f725929837610b0f8a56269353ff6a95..26d422a710b35689df5cbcbdee88bbf1300b1809 100644
--- a/src/crankshaft/mips/lithium-mips.cc
+++ b/src/crankshaft/mips/lithium-mips.cc
@@ -1922,7 +1922,12 @@ LInstruction* LChunkBuilder::DoConstant(HConstant* instr) {
 
 LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
   LOperand* context = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new (zone()) LLoadContextSlot(context));
+  LInstruction* result =
+      DefineAsRegister(new(zone()) LLoadContextSlot(context));
+  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
+    result = AssignEnvironment(result);
+  }
+  return result;
 }
 
 
@@ -1936,7 +1941,11 @@ LInstruction* LChunkBuilder::DoStoreContextSlot(HStoreContextSlot* instr) {
     context = UseRegister(instr->context());
     value = UseRegister(instr->value());
   }
-  return new (zone()) LStoreContextSlot(context, value);
+  LInstruction* result = new(zone()) LStoreContextSlot(context, value);
+  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
+    result = AssignEnvironment(result);
+  }
+  return result;
 }