Small IL cleanup.

runtime/vm/flow_graph_optimizer.cc

Index: runtime/vm/flow_graph_optimizer.cc
===================================================================
--- runtime/vm/flow_graph_optimizer.cc	(revision 14070)
+++ runtime/vm/flow_graph_optimizer.cc	(working copy)
@@ -1081,15 +1081,6 @@
   MethodRecognizer::Kind recognized_kind =
       MethodRecognizer::RecognizeKind(target);
 
-  if ((recognized_kind == MethodRecognizer::kDoubleToDouble) &&
-      (class_ids[0] == kDoubleCid)) {
-    DoubleToDoubleInstr* d2d_instr =
-        new DoubleToDoubleInstr(call->ArgumentAt(0)->value(), call);
-    call->ReplaceWith(d2d_instr, current_iterator());
-    RemovePushArguments(call);
-    return true;
-  }
-
   if ((recognized_kind == MethodRecognizer::kIntegerToDouble) &&
       (class_ids[0] == kSmiCid)) {
     SmiToDoubleInstr* s2d_instr = new SmiToDoubleInstr(call);
@@ -1099,21 +1090,6 @@
     return true;
   }
 
-  const intptr_t cid0 = class_ids[0];
-  if ((recognized_kind == MethodRecognizer::kIntegerToInteger) &&
-      ((cid0 == kSmiCid) || (cid0 == kMintCid) || (cid0 == kBigintCid))) {
-    // TODO(srdjan): implement also for mixed integer cids.
-    InsertBefore(call,
-                 new CheckSmiInstr(call->ArgumentAt(0)->value()->Copy(),
-                                   call->deopt_id()),
-                 call->env(),
-                 Definition::kEffect);
-    call->ReplaceUsesWith(call->ArgumentAt(0));
-    RemovePushArguments(call);
-    call->RemoveFromGraph();
-    return true;
-  }
-
   if ((recognized_kind == MethodRecognizer::kDoubleToInteger) &&
       (class_ids[0] == kDoubleCid)) {
     AddCheckClass(call, call->ArgumentAt(0)->value()->Copy());
@@ -3308,17 +3284,6 @@
 }
 
 
-void ConstantPropagator::VisitDoubleToDouble(DoubleToDoubleInstr* instr) {
-  const Object& value = instr->value()->definition()->constant_value();
-  if (IsNonConstant(value)) {
-    SetValue(instr, non_constant_);
-  } else if (IsConstant(value)) {
-    // TODO(kmillikin): Handle conversion.
-    SetValue(instr, non_constant_);
-  }
-}
-
-
 void ConstantPropagator::VisitSmiToDouble(SmiToDoubleInstr* instr) {
   // TODO(kmillikin): Handle conversion.
   SetValue(instr, non_constant_);