[crankshaft] Remove dead Variable hole-checking code

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

Index: src/crankshaft/arm/lithium-codegen-arm.cc
diff --git a/src/crankshaft/arm/lithium-codegen-arm.cc b/src/crankshaft/arm/lithium-codegen-arm.cc
index 07accfbb080212d447f326a05399a5e6aaba13c9..10b0f849412f5073151678ee20b79beb5fc773e1 100644
--- a/src/crankshaft/arm/lithium-codegen-arm.cc
+++ b/src/crankshaft/arm/lithium-codegen-arm.cc
@@ -2567,15 +2567,6 @@ 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()) {
-    __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
-    __ cmp(result, ip);
-    if (instr->hydrogen()->DeoptimizesOnHole()) {
-      DeoptimizeIf(eq, instr, DeoptimizeReason::kHole);
-    } else {
-      __ mov(result, Operand(factory()->undefined_value()), LeaveCC, eq);
-    }
-  }
 }
 
 
@@ -2585,19 +2576,6 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
   Register scratch = scratch0();
   MemOperand target = ContextMemOperand(context, instr->slot_index());
 
-  Label skip_assignment;
-
-  if (instr->hydrogen()->RequiresHoleCheck()) {
-    __ ldr(scratch, target);
-    __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
-    __ cmp(scratch, ip);
-    if (instr->hydrogen()->DeoptimizesOnHole()) {
-      DeoptimizeIf(eq, instr, DeoptimizeReason::kHole);
-    } else {
-      __ b(ne, &skip_assignment);
-    }
-  }
-
   __ str(value, target);
   if (instr->hydrogen()->NeedsWriteBarrier()) {
     SmiCheck check_needed =
@@ -2612,8 +2590,6 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
                               EMIT_REMEMBERED_SET,
                               check_needed);
   }
-
-  __ bind(&skip_assignment);
 }