Reenable function source fingerprint checks. Added checks to MethodRecognizer.

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 VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1422 matching lines @@
   // function.
   // The function and the class share the same given name.
   static RawFunction* NewClosureFunction(const String& name,
                                          const Function& parent,
                                          intptr_t token_pos);
 
   // Slow function, use in asserts to track changes in important library
   // functions.
   int32_t SourceFingerprint() const;
 
+  // Return false and report an error if the fingerprint does not match.
+  bool CheckSourceFingerprint(intptr_t fp) const;
+
   static const int kCtorPhaseInit = 1 << 0;
   static const int kCtorPhaseBody = 1 << 1;
   static const int kCtorPhaseAll = (kCtorPhaseInit | kCtorPhaseBody);
 
  private:
   enum KindTagBits {
     kStaticBit = 0,
     kConstBit = 1,
     kOptimizableBit = 2,
     kInlinableBit = 3,
@@ skipping 4522 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_