[vm,aot] Improve performance of certain 'is' operations

runtime/vm/il_printer.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/il_printer.h"
 
 #include "vm/flow_graph_range_analysis.h"
 #include "vm/intermediate_language.h"
 #include "vm/os.h"
 #include "vm/parser.h"
@@ skipping 148 matching lines @@
       eliminated ? "more" : "not more",
       String::Handle(dst_type.Name()).ToCString(), dst_name.ToCString());
 }
 
 void CompileType::PrintTo(BufferFormatter* f) const {
   const char* type_name = "?";
   if ((cid_ != kIllegalCid) && (cid_ != kDynamicCid)) {
     const Class& cls =
         Class::Handle(Isolate::Current()->class_table()->At(cid_));
     type_name = String::Handle(cls.ScrubbedName()).ToCString();
-  } else if (type_ != NULL &&
-             !type_->Equals(Type::Handle(Type::DynamicType()))) {
+  } else if (type_ != NULL && !type_->IsDynamicType()) {
     type_name = type_->ToCString();
   } else if (!is_nullable()) {
     type_name = "!null";
   }
 
   f->Print("T{%s%s}", type_name, is_nullable_ ? "?" : "");
 }
 
 const char* CompileType::ToCString() const {
   char buffer[1024];
@@ skipping 180 matching lines @@
     f->Print("%s(", DebugName());
   }
   PrintOperandsTo(f);
   f->Print(")");
   if (range_ != NULL) {
     f->Print(" ");
     range_->PrintTo(f);
   }
 
   if (type_ != NULL &&
-      ((type_->ToNullableCid() != kDynamicCid) || !type_->is_nullable())) {
+      ((type_->ToNullableCid() != kDynamicCid) ||
+       !type_->ToAbstractType()->IsDynamicType() || !type_->is_nullable())) {
     f->Print(" ");
     type_->PrintTo(f);
   }
 }
 
 void Definition::PrintOperandsTo(BufferFormatter* f) const {
   for (int i = 0; i < InputCount(); ++i) {
     if (i > 0) f->Print(", ");
     if (InputAt(i) != NULL) {
       InputAt(i)->PrintTo(f);
@@ skipping 907 matching lines @@
   UNREACHABLE();
 }
 
 bool FlowGraphPrinter::ShouldPrint(const Function& function) {
   return false;
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart