Deoptimization can occur at Dart calls (includes native calls to C) but not at runtime calls. This …

runtime/vm/code_generator.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 VM_CODE_GENERATOR_H_
 #define VM_CODE_GENERATOR_H_
 
 #include "vm/globals.h"
 #include "vm/runtime_entry.h"
 
@@ skipping 62 matching lines @@
   V(DeoptDoubleComparison)                                                     \
   V(DeoptLoadIndexedFixedArray)                                                \
   V(DeoptLoadIndexedGrowableArray)                                             \
   V(DeoptLoadIndexedPolymorphic)                                               \
   V(DeoptNoTypeFeedback)                                                       \
   V(DeoptSAR)                                                                  \
   V(DeoptUnaryOp)                                                              \
   V(DeoptCheckClass)                                                           \
   V(DeoptCheckSmi)                                                             \
   V(DeoptAtCall)                                                               \
+  V(DeoptNumReasons)                                                           \
 
 enum DeoptReasonId {
 #define DEFINE_ENUM_LIST(name) k##name,
 DEOPT_REASONS(DEFINE_ENUM_LIST)
 #undef DEFINE_ENUM_LIST
 };
 
 
 RawCode* ResolveCompileInstanceCallTarget(Isolate* isolate,
                                           const Instance& receiver);
 
+void DeoptimizeAll();
+
 }  // namespace dart
 
 #endif  // VM_CODE_GENERATOR_H_