[turbofan] Add proper conversion operators for int32<->int64.

test/compiler-unittests/graph-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/compiler-unittests/graph-unittest.h"
 
 #include <ostream>  // NOLINT(readability/streams)
 
 #include "src/compiler/node-properties-inl.h"
 
@@ skipping 658 matching lines @@
 IS_BINOP_MATCHER(Word64Shl)
 IS_BINOP_MATCHER(Word64Equal)
 IS_BINOP_MATCHER(Int32AddWithOverflow)
 #undef IS_BINOP_MATCHER
 
 
 #define IS_UNOP_MATCHER(Name)                                                \
   Matcher<Node*> Is##Name(const Matcher<Node*>& input_matcher) {             \
     return MakeMatcher(new IsUnopMatcher(IrOpcode::k##Name, input_matcher)); \
   }
-IS_UNOP_MATCHER(ConvertInt64ToInt32)
 IS_UNOP_MATCHER(ChangeFloat64ToInt32)
 IS_UNOP_MATCHER(ChangeInt32ToFloat64)
+IS_UNOP_MATCHER(ChangeInt32ToInt64)
+IS_UNOP_MATCHER(ChangeUint32ToUint64)
+IS_UNOP_MATCHER(TruncateInt64ToInt32)
 #undef IS_UNOP_MATCHER
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8