[vm] Rename *MintOp to *Int64Op to emphasis that they operate on unboxed values.

runtime/vm/locations.cc

 // 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.
 
 #include "vm/locations.h"
 
 #include "vm/assembler.h"
 #include "vm/il_printer.h"
 #include "vm/log.h"
 #include "vm/stack_frame.h"
@@ skipping 241 matching lines @@
 
       case kUnboxedFloat32x4:
       case kUnboxedInt32x4:
       case kUnboxedFloat64x2:
         return Location::QuadStackSlot(index);
 
       default:
         UNREACHABLE();
     }
   } else if (IsPairLocation()) {
-    ASSERT(def->representation() == kUnboxedMint);
+    ASSERT(def->representation() == kUnboxedInt64);
     PairLocation* value_pair = AsPairLocation();
     intptr_t index_lo;
     intptr_t index_hi;
 
     if (value_pair->At(0).IsRegister()) {
       index_lo = cpu_reg_slots[value_pair->At(0).reg()];
     } else {
       ASSERT(value_pair->At(0).IsStackSlot());
       index_lo = value_pair->At(0).stack_index();
     }
@@ skipping 67 matching lines @@
       // with the right representation because register allocator does not know
       // how they are used within the instruction template.
       ASSERT(in(i).IsMachineRegister());
       ASSERT(live_registers()->Contains(in(i)));
     }
   }
 }
 #endif
 
 }  // namespace dart