Fuse comparisons that are used by branches together.

runtime/vm/il_printer.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/il_printer.h"
 
 #include "vm/intermediate_language.h"
 #include "vm/os.h"
 
 namespace dart {
@@ skipping 368 matching lines @@
   exception()->PrintTo(f);
   f->Print(", ");
   stack_trace()->PrintTo(f);
 }
 
 
 void BranchInstr::PrintTo(BufferFormatter* f) const {
   f->Print("    %s ", DebugName());
   f->Print("if ");
   value()->PrintTo(f);
+  if (is_fused_with_comparison()) {
+    f->Print(" (fused)");
+  }
   f->Print(" goto (%d, %d)",
             true_successor()->block_id(),
             false_successor()->block_id());
 }
 
 
 void FlowGraphVisualizer::Print(const char* format, ...) {
   char str[120];
   BufferFormatter f(str, sizeof(str));
   f.Print("%*s", 2 * indent_, "");
@@ skipping 170 matching lines @@
   f->Print("_ %s ", DebugName());
   f->Print("if ");
   value()->PrintTo(f);
   f->Print(" goto (B%d, B%d)",
             true_successor()->block_id(),
             false_successor()->block_id());
 }
 
 
 }  // namespace dart