Remove functions_cache_ and it's references as it is not being used anymore.

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 537 matching lines @@
   // Set the resolved or unresolved factory class of this interface.
   void set_factory_class(const Object& value) const;
 
   // Interfaces is an array of Types.
   RawArray* interfaces() const { return raw_ptr()->interfaces_; }
   void set_interfaces(const Array& value) const;
   static intptr_t interfaces_offset() {
     return OFFSET_OF(RawClass, interfaces_);
   }
 
-  RawArray* functions_cache() const { return raw_ptr()->functions_cache_; }
-  void set_functions_cache(const Array& value) const;
-
-  static intptr_t functions_cache_offset() {
-    return OFFSET_OF(RawClass, functions_cache_);
-  }
-
   // Check if this class represents the class of null.
   bool IsNullClass() const { return raw() == Object::null_class(); }
 
   // Check if this class represents the 'Dynamic' class.
   bool IsDynamicClass() const { return raw() == Object::dynamic_class(); }
 
   // Check if this class represents the 'void' class.
   bool IsVoidClass() const { return raw() == Object::void_class(); }
 
   // Check if this class represents the 'Object' class.
@@ skipping 106 matching lines @@
 
   RawCode* allocation_stub() const {
     return raw_ptr()->allocation_stub_;
   }
   void set_allocation_stub(const Code& value) const;
 
   RawArray* constants() const;
 
   void Finalize() const;
 
-  // Initialize the functions cache array.
-  void InitFunctionsCache() const;
-
   // Allocate a class used for VM internal objects.
   template <class FakeObject> static RawClass* New();
 
   // Allocate instance classes and interfaces.
   static RawClass* New(const String& name,
                        const Script& script,
                        intptr_t token_pos);
   static RawClass* NewInterface(const String& name,
                                 const Script& script,
                                 intptr_t token_pos);
@@ skipping 4758 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_