[crankshaft] Remove dead Variable hole-checking code

src/crankshaft/arm64/lithium-codegen-arm64.cc

Index: src/crankshaft/arm64/lithium-codegen-arm64.cc
diff --git a/src/crankshaft/arm64/lithium-codegen-arm64.cc b/src/crankshaft/arm64/lithium-codegen-arm64.cc
index 141ac3f6108217e805e45cc83fccb9ed58654af7..07b8355eb3fc5511bd907eedcf63da19d67b637e 100644
--- a/src/crankshaft/arm64/lithium-codegen-arm64.cc
+++ b/src/crankshaft/arm64/lithium-codegen-arm64.cc
@@ -2969,17 +2969,6 @@ void LCodeGen::DoLoadContextSlot(LLoadContextSlot* instr) {
   Register context = ToRegister(instr->context());
   Register result = ToRegister(instr->result());
   __ Ldr(result, ContextMemOperand(context, instr->slot_index()));
-  if (instr->hydrogen()->RequiresHoleCheck()) {
-    if (instr->hydrogen()->DeoptimizesOnHole()) {
-      DeoptimizeIfRoot(result, Heap::kTheHoleValueRootIndex, instr,
-                       DeoptimizeReason::kHole);
-    } else {
-      Label not_the_hole;
-      __ JumpIfNotRoot(result, Heap::kTheHoleValueRootIndex, &not_the_hole);
-      __ LoadRoot(result, Heap::kUndefinedValueRootIndex);
-      __ Bind(&not_the_hole);
-    }
-  }
 }
 
 
@@ -4683,18 +4672,6 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
   Register scratch = ToRegister(instr->temp());
   MemOperand target = ContextMemOperand(context, instr->slot_index());
 
-  Label skip_assignment;
-
-  if (instr->hydrogen()->RequiresHoleCheck()) {
-    __ Ldr(scratch, target);
-    if (instr->hydrogen()->DeoptimizesOnHole()) {
-      DeoptimizeIfRoot(scratch, Heap::kTheHoleValueRootIndex, instr,
-                       DeoptimizeReason::kHole);
-    } else {
-      __ JumpIfNotRoot(scratch, Heap::kTheHoleValueRootIndex, &skip_assignment);
-    }
-  }
-
   __ Str(value, target);
   if (instr->hydrogen()->NeedsWriteBarrier()) {
     SmiCheck check_needed =
@@ -4704,7 +4681,6 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
                               scratch, GetLinkRegisterState(), kSaveFPRegs,
                               EMIT_REMEMBERED_SET, check_needed);
   }
-  __ Bind(&skip_assignment);
 }