Rename is_call to always_calls and contains_call to can_call.

runtime/vm/flow_graph_optimizer.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/flow_graph_optimizer.h"
 
 #include "vm/flow_graph_builder.h"
 #include "vm/il_printer.h"
 #include "vm/object_store.h"
 #include "vm/parser.h"
@@ skipping 698 matching lines @@
   } while (still_changing_);
 }
 
 
 void FlowGraphAnalyzer::Analyze() {
   is_leaf_ = true;
   for (intptr_t i = 0; i < blocks_.length(); ++i) {
     BlockEntryInstr* entry = blocks_[i];
     for (ForwardInstructionIterator it(entry); !it.Done(); it.Advance()) {
       LocationSummary* locs = it.Current()->locs();
-      if ((locs != NULL) && locs->contains_call()) {
+      if ((locs != NULL) && locs->can_call()) {
         is_leaf_ = false;
         return;
       }
     }
   }
 }
 
 }  // namespace dart