[crankshaft] Remove dead Variable hole-checking code

src/crankshaft/x64/lithium-x64.cc

Index: src/crankshaft/x64/lithium-x64.cc
diff --git a/src/crankshaft/x64/lithium-x64.cc b/src/crankshaft/x64/lithium-x64.cc
index bc9040b94cc19c8f934d0b7dc36f6408029e0d78..318593e467356327396228e38c2e952571179df8 100644
--- a/src/crankshaft/x64/lithium-x64.cc
+++ b/src/crankshaft/x64/lithium-x64.cc
@@ -1961,12 +1961,7 @@ LInstruction* LChunkBuilder::DoConstant(HConstant* instr) {
 
 LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
   LOperand* context = UseRegisterAtStart(instr->value());
-  LInstruction* result =
-      DefineAsRegister(new(zone()) LLoadContextSlot(context));
-  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
-    result = AssignEnvironment(result);
-  }
-  return result;
+  return DefineAsRegister(new (zone()) LLoadContextSlot(context));
 }
 
 
@@ -1982,11 +1977,7 @@ LInstruction* LChunkBuilder::DoStoreContextSlot(HStoreContextSlot* instr) {
     value = UseRegister(instr->value());
     temp = NULL;
   }
-  LInstruction* result = new(zone()) LStoreContextSlot(context, value, temp);
-  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
-    result = AssignEnvironment(result);
-  }
-  return result;
+  return new (zone()) LStoreContextSlot(context, value, temp);
 }