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

runtime/vm/flow_graph_allocator.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/flow_graph_allocator.h"
 
 #include "vm/bit_vector.h"
 #include "vm/flow_graph.h"
 #include "vm/flow_graph_compiler.h"
 #include "vm/il_printer.h"
@@ skipping 2830 matching lines @@
         range->assigned_location().IsConstant()) {
       ASSERT(range->assigned_location().Equals(range->spill_slot()));
     } else {
       AddMoveAt(range->Start() + 1, range->spill_slot(),
                 range->assigned_location());
     }
   }
 }
 
 static Representation RepresentationForRange(Representation definition_rep) {
-  if (definition_rep == kUnboxedMint) {
-    // kUnboxedMint is split into two ranges, each of which are kUntagged.
+  if (definition_rep == kUnboxedInt64) {
+    // kUnboxedInt64 is split into two ranges, each of which are kUntagged.
     return kUntagged;
   } else if (definition_rep == kUnboxedUint32) {
     // kUnboxedUint32 is untagged.
     return kUntagged;
   }
   return definition_rep;
 }
 
 void FlowGraphAllocator::CollectRepresentations() {
   // Parameters.
@@ skipping 146 matching lines @@
 #ifndef PRODUCT
       FlowGraphPrinter printer(flow_graph_, true);
       printer.PrintBlocks();
 #endif
     }
     THR_Print("----------------------------------------------\n");
   }
 }
 
 }  // namespace dart