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

runtime/vm/flow_graph_compiler.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/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
@@ skipping 1642 matching lines @@
 const Class& FlowGraphCompiler::BoxClassFor(Representation rep) {
   switch (rep) {
     case kUnboxedDouble:
       return double_class();
     case kUnboxedFloat32x4:
       return float32x4_class();
     case kUnboxedFloat64x2:
       return float64x2_class();
     case kUnboxedInt32x4:
       return int32x4_class();
-    case kUnboxedMint:
+    case kUnboxedInt64:
       return mint_class();
     default:
       UNREACHABLE();
       return Class::ZoneHandle();
   }
 }
 
 void FlowGraphCompiler::BeginCodeSourceRange() {
   code_source_map_builder_->BeginCodeSourceRange(assembler()->CodeSize());
 }
@@ skipping 271 matching lines @@
   return true;
 }
 
 void FlowGraphCompiler::FrameStateClear() {
   ASSERT(!is_optimizing());
   frame_state_.TruncateTo(0);
 }
 #endif  // defined(DEBUG) && !defined(TARGET_ARCH_DBC)
 
 }  // namespace dart