Revert remove dead hole check logic

src/crankshaft/s390/lithium-codegen-s390.cc

Index: src/crankshaft/s390/lithium-codegen-s390.cc
diff --git a/src/crankshaft/s390/lithium-codegen-s390.cc b/src/crankshaft/s390/lithium-codegen-s390.cc
index bbc8f839451389c73bc629f623f4447938815768..7b287c9844ef899f292e1588948440efcfe38a8e 100644
--- a/src/crankshaft/s390/lithium-codegen-s390.cc
+++ b/src/crankshaft/s390/lithium-codegen-s390.cc
@@ -2634,6 +2634,17 @@ void LCodeGen::DoLoadContextSlot(LLoadContextSlot* instr) {
   Register context = ToRegister(instr->context());
   Register result = ToRegister(instr->result());
   __ LoadP(result, ContextMemOperand(context, instr->slot_index()));
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    __ CompareRoot(result, Heap::kTheHoleValueRootIndex);
+    if (instr->hydrogen()->DeoptimizesOnHole()) {
+      DeoptimizeIf(eq, instr, DeoptimizeReason::kHole);
+    } else {
+      Label skip;
+      __ bne(&skip, Label::kNear);
+      __ mov(result, Operand(factory()->undefined_value()));
+      __ bind(&skip);
+    }
+  }
 }
 
 void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
@@ -2642,6 +2653,18 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
   Register scratch = scratch0();
   MemOperand target = ContextMemOperand(context, instr->slot_index());
 
+  Label skip_assignment;
+
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    __ LoadP(scratch, target);
+    __ CompareRoot(scratch, Heap::kTheHoleValueRootIndex);
+    if (instr->hydrogen()->DeoptimizesOnHole()) {
+      DeoptimizeIf(eq, instr, DeoptimizeReason::kHole);
+    } else {
+      __ bne(&skip_assignment);
+    }
+  }
+
   __ StoreP(value, target);
   if (instr->hydrogen()->NeedsWriteBarrier()) {
     SmiCheck check_needed = instr->hydrogen()->value()->type().IsHeapObject()
@@ -2651,6 +2674,8 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
                               GetLinkRegisterState(), kSaveFPRegs,
                               EMIT_REMEMBERED_SET, check_needed);
   }
+
+  __ bind(&skip_assignment);
 }
 
 void LCodeGen::DoLoadNamedField(LLoadNamedField* instr) {