ICData::NumberOfChecks is O(n) so don't call it in loops

runtime/vm/object.h

 // 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.
 
 #ifndef RUNTIME_VM_OBJECT_H_
 #define RUNTIME_VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1900 matching lines @@
   uint32_t DeoptReasons() const;
   void SetDeoptReasons(uint32_t reasons) const;
 
   bool HasDeoptReason(ICData::DeoptReasonId reason) const;
   void AddDeoptReason(ICData::DeoptReasonId reason) const;
 
   // The length of the array. This includes all sentinel entries including
   // the final one.
   intptr_t Length() const;
 
+  // Takes O(result) time!
   intptr_t NumberOfChecks() const;
 
   // Discounts any checks with usage of zero.
+  // Takes O(result)) time!
   intptr_t NumberOfUsedChecks() const;
 
+  // Takes O(n) time!
+  bool NumberOfChecksIs(intptr_t n) const;
+
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawICData));
   }
 
   static intptr_t target_name_offset() {
     return OFFSET_OF(RawICData, target_name_);
   }
 
   static intptr_t state_bits_offset() {
     return OFFSET_OF(RawICData, state_bits_);
@@ skipping 6982 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OBJECT_H_