Add unboxed Mint for X64

runtime/vm/intermediate_language.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_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 1624 matching lines @@
   bool HasTemp() const { return temp_index_ >= 0; }
 
   intptr_t ssa_temp_index() const { return ssa_temp_index_; }
   void set_ssa_temp_index(intptr_t index) {
     ASSERT(index >= 0);
     ssa_temp_index_ = index;
   }
   bool HasSSATemp() const { return ssa_temp_index_ >= 0; }
   void ClearSSATempIndex() { ssa_temp_index_ = -1; }
   bool HasPairRepresentation() const {
+#if defined(TARGET_ARCH_X64)
+    return (representation() == kPairOfTagged) ||
+           (representation() == kPairOfUnboxedDouble);
+#else
     return (representation() == kPairOfTagged) ||
            (representation() == kPairOfUnboxedDouble) ||
            (representation() == kUnboxedMint);
+#endif
   }
 
   // Compile time type of the definition, which may be requested before type
   // propagation during graph building.
   CompileType* Type() {
     if (type_ == NULL) {
       type_ = ComputeInitialType();
     }
     return type_;
   }
@@ skipping 6753 matching lines @@
       Isolate* isolate, bool opt) const {                                     \
     UNIMPLEMENTED();                                                          \
     return NULL;                                                              \
   }                                                                           \
   void Name::EmitNativeCode(FlowGraphCompiler* compiler) { UNIMPLEMENTED(); }
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_