VM: Re-format to use at most one newline between functions

runtime/vm/branch_optimizer.h

 // Copyright (c) 2016, 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_BRANCH_OPTIMIZER_H_
 #define RUNTIME_VM_BRANCH_OPTIMIZER_H_
 
 #include "vm/allocation.h"
 
 namespace dart {
@@ skipping 23 matching lines @@
   static bool Match(JoinEntryInstr* block);
 
   // Duplicate a branch while replacing its comparison's left and right
   // inputs.
   static BranchInstr* CloneBranch(Zone* zone,
                                   BranchInstr* branch,
                                   Value* new_left,
                                   Value* new_right);
 };
 
-
 // Rewrite diamond control flow patterns that materialize values to use more
 // efficient branchless code patterns if such are supported on the current
 // platform.
 class IfConverter : public AllStatic {
  public:
   static void Simplify(FlowGraph* flow_graph);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_BRANCH_OPTIMIZER_H_