[crankshaft] Remove dead Variable hole-checking code

src/crankshaft/x64/lithium-codegen-x64.cc

Index: src/crankshaft/x64/lithium-codegen-x64.cc
diff --git a/src/crankshaft/x64/lithium-codegen-x64.cc b/src/crankshaft/x64/lithium-codegen-x64.cc
index f09af7136ece42cf3932406bf0a773856fe31871..4b36f96d20158f386788f7802cbc8ad96215ea78 100644
--- a/src/crankshaft/x64/lithium-codegen-x64.cc
+++ b/src/crankshaft/x64/lithium-codegen-x64.cc
@@ -2505,37 +2505,15 @@ void LCodeGen::DoLoadContextSlot(LLoadContextSlot* instr) {
   Register context = ToRegister(instr->context());
   Register result = ToRegister(instr->result());
   __ movp(result, ContextOperand(context, instr->slot_index()));
-  if (instr->hydrogen()->RequiresHoleCheck()) {
-    __ CompareRoot(result, Heap::kTheHoleValueRootIndex);
-    if (instr->hydrogen()->DeoptimizesOnHole()) {
-      DeoptimizeIf(equal, instr, DeoptimizeReason::kHole);
-    } else {
-      Label is_not_hole;
-      __ j(not_equal, &is_not_hole, Label::kNear);
-      __ LoadRoot(result, Heap::kUndefinedValueRootIndex);
-      __ bind(&is_not_hole);
-    }
-  }
 }
 
 
 void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
   Register context = ToRegister(instr->context());
   Register value = ToRegister(instr->value());
-
   Operand target = ContextOperand(context, instr->slot_index());
 
-  Label skip_assignment;
-  if (instr->hydrogen()->RequiresHoleCheck()) {
-    __ CompareRoot(target, Heap::kTheHoleValueRootIndex);
-    if (instr->hydrogen()->DeoptimizesOnHole()) {
-      DeoptimizeIf(equal, instr, DeoptimizeReason::kHole);
-    } else {
-      __ j(not_equal, &skip_assignment);
-    }
-  }
   __ movp(target, value);
-
   if (instr->hydrogen()->NeedsWriteBarrier()) {
     SmiCheck check_needed =
       instr->hydrogen()->value()->type().IsHeapObject()
@@ -2550,8 +2528,6 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
                               EMIT_REMEMBERED_SET,
                               check_needed);
   }
-
-  __ bind(&skip_assignment);
 }