Add Function based profile tree

runtime/vm/instructions_ia32.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/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/cpu.h"
 #include "vm/instructions.h"
 #include "vm/object.h"
@@ skipping 31 matching lines @@
   return kCallPattern;
 }
 
 
 const int* JumpPattern::pattern() const {
   static const int kJumpPattern[kLengthInBytes] = {0xE9, -1, -1, -1, -1};
   return kJumpPattern;
 }
 
 
+const int* ReturnPattern::pattern() const {
+  static const int kReturnPattern[kLengthInBytes] = { 0xC3 };
+  return kReturnPattern;
+}
+
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32