Revert remove dead hole check logic

src/crankshaft/x87/lithium-codegen-x87.cc

Index: src/crankshaft/x87/lithium-codegen-x87.cc
diff --git a/src/crankshaft/x87/lithium-codegen-x87.cc b/src/crankshaft/x87/lithium-codegen-x87.cc
index 20df76774bf58f4c66eb74ac37bc4a2aa3effd9f..9c932bc6ae8b81dd8b1496ba5758b6bcd4a05cb9 100644
--- a/src/crankshaft/x87/lithium-codegen-x87.cc
+++ b/src/crankshaft/x87/lithium-codegen-x87.cc
@@ -2648,13 +2648,36 @@ void LCodeGen::DoLoadContextSlot(LLoadContextSlot* instr) {
   Register context = ToRegister(instr->context());
   Register result = ToRegister(instr->result());
   __ mov(result, ContextOperand(context, instr->slot_index()));
+
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    __ cmp(result, factory()->the_hole_value());
+    if (instr->hydrogen()->DeoptimizesOnHole()) {
+      DeoptimizeIf(equal, instr, DeoptimizeReason::kHole);
+    } else {
+      Label is_not_hole;
+      __ j(not_equal, &is_not_hole, Label::kNear);
+      __ mov(result, factory()->undefined_value());
+      __ bind(&is_not_hole);
+    }
+  }
 }
 
 
 void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
   Register context = ToRegister(instr->context());
   Register value = ToRegister(instr->value());
+
+  Label skip_assignment;
+
   Operand target = ContextOperand(context, instr->slot_index());
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    __ cmp(target, factory()->the_hole_value());
+    if (instr->hydrogen()->DeoptimizesOnHole()) {
+      DeoptimizeIf(equal, instr, DeoptimizeReason::kHole);
+    } else {
+      __ j(not_equal, &skip_assignment, Label::kNear);
+    }
+  }
 
   __ mov(target, value);
   if (instr->hydrogen()->NeedsWriteBarrier()) {
@@ -2666,6 +2689,8 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
     __ RecordWriteContextSlot(context, offset, value, temp, kSaveFPRegs,
                               EMIT_REMEMBERED_SET, check_needed);
   }
+
+  __ bind(&skip_assignment);
 }