Fix Win64 build of Dart VM.

runtime/vm/locations.h

 // Copyright (c) 2013, 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_LOCATIONS_H_
 #define VM_LOCATIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/bitfield.h"
@@ skipping 454 matching lines @@
   void MarkUntagged(Location loc) {
     ASSERT(loc.IsRegister());
     untagged_cpu_registers_ |= (1 << loc.reg());
   }
 
   bool IsTagged(Register reg) const {
     return (untagged_cpu_registers_ & (1 << reg)) == 0;
   }
 
   bool ContainsRegister(Register reg) const {
-    return (cpu_registers_ & (1 << reg)) != 0;
+    return Contains(cpu_registers_, reg);
   }
 
   bool ContainsFpuRegister(FpuRegister fpu_reg) const {
-    return (fpu_registers_ & (1 << fpu_reg)) != 0;
+    return Contains(fpu_registers_, fpu_reg);
   }
 
   intptr_t CpuRegisterCount() const { return RegisterCount(cpu_registers_); }
   intptr_t FpuRegisterCount() const { return RegisterCount(fpu_registers_); }
 
   static intptr_t RegisterCount(intptr_t registers);
+  static bool Contains(intptr_t register_set, intptr_t reg) {
+    return (register_set & (1 << reg)) != 0;
+  }
 
   intptr_t cpu_registers() const { return cpu_registers_; }
   intptr_t fpu_registers() const { return fpu_registers_; }
 
  private:
   intptr_t cpu_registers_;
   intptr_t untagged_cpu_registers_;
   intptr_t fpu_registers_;
 
   DISALLOW_COPY_AND_ASSIGN(RegisterSet);
@@ skipping 125 matching lines @@
   BitmapBuilder* stack_bitmap_;
 
   const ContainsCall contains_call_;
   RegisterSet live_registers_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_LOCATIONS_H_