[crankshaft] Remove dead Variable hole-checking code

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

Index: src/crankshaft/ppc/lithium-codegen-ppc.cc
diff --git a/src/crankshaft/ppc/lithium-codegen-ppc.cc b/src/crankshaft/ppc/lithium-codegen-ppc.cc
index f546dc22d2546f55b454347332ae415c7c6e5ebd..2956fccc0acee2be456f055204f03ea7deaf4e5e 100644
--- a/src/crankshaft/ppc/lithium-codegen-ppc.cc
+++ b/src/crankshaft/ppc/lithium-codegen-ppc.cc
@@ -2658,26 +2658,6 @@ 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()) {
-    __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
-    if (instr->hydrogen()->DeoptimizesOnHole()) {
-      __ cmp(result, ip);
-      DeoptimizeIf(eq, instr, DeoptimizeReason::kHole);
-    } else {
-      if (CpuFeatures::IsSupported(ISELECT)) {
-        Register scratch = scratch0();
-        __ mov(scratch, Operand(factory()->undefined_value()));
-        __ cmp(result, ip);
-        __ isel(eq, result, scratch, result);
-      } else {
-        Label skip;
-        __ cmp(result, ip);
-        __ bne(&skip);
-        __ mov(result, Operand(factory()->undefined_value()));
-        __ bind(&skip);
-      }
-    }
-  }
 }
 
 
@@ -2687,19 +2667,6 @@ 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);
-    __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
-    __ cmp(scratch, ip);
-    if (instr->hydrogen()->DeoptimizesOnHole()) {
-      DeoptimizeIf(eq, instr, DeoptimizeReason::kHole);
-    } else {
-      __ bne(&skip_assignment);
-    }
-  }
-
   __ StoreP(value, target, r0);
   if (instr->hydrogen()->NeedsWriteBarrier()) {
     SmiCheck check_needed = instr->hydrogen()->value()->type().IsHeapObject()
@@ -2709,8 +2676,6 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
                               GetLinkRegisterState(), kSaveFPRegs,
                               EMIT_REMEMBERED_SET, check_needed);
   }
-
-  __ bind(&skip_assignment);
 }