VM: More compact code for pushing constant arguments on ia32/x64.

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 130 matching lines @@
 
   bool IsInvalid() const {
     return value_ == kInvalidLocation;
   }
 
   // Constants.
   bool IsConstant() const {
     return (value_ & kLocationTagMask) == kConstantTag;
   }
 
-  static Location Constant(ConstantInstr* obj) {
+  static Location Constant(const ConstantInstr* obj) {
     Location loc(reinterpret_cast<uword>(obj) | kConstantTag);
     ASSERT(obj == loc.constant_instruction());
     return loc;
   }
 
   ConstantInstr* constant_instruction() const {
     ASSERT(IsConstant());
     return reinterpret_cast<ConstantInstr*>(value_ & ~kLocationTagMask);
   }
 
@@ skipping 547 matching lines @@
 
 #if defined(DEBUG)
   intptr_t writable_inputs_;
 #endif
 };
 
 
 }  // namespace dart
 
 #endif  // VM_LOCATIONS_H_