[turbofan] Add support for change/truncate to MachineOperatorReducer.

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 37 matching lines @@
 Node* GraphTest::Float64Constant(double value) {
   return graph()->NewNode(common()->Float64Constant(value));
 }
 
 
 Node* GraphTest::Int32Constant(int32_t value) {
   return graph()->NewNode(common()->Int32Constant(value));
 }
 
 
+Node* GraphTest::Int64Constant(int64_t value) {
+  return graph()->NewNode(common()->Int64Constant(value));
+}
+
+
 Node* GraphTest::NumberConstant(double value) {
   return graph()->NewNode(common()->NumberConstant(value));
 }
 
 
 Node* GraphTest::HeapConstant(const PrintableUnique<HeapObject>& value) {
   return graph()->NewNode(common()->HeapConstant(value));
 }
 
 
@@ skipping 572 matching lines @@
       IrOpcode::kHeapConstant, value_matcher));
 }
 
 
 Matcher<Node*> IsInt32Constant(const Matcher<int32_t>& value_matcher) {
   return MakeMatcher(
       new IsConstantMatcher<int32_t>(IrOpcode::kInt32Constant, value_matcher));
 }
 
 
+Matcher<Node*> IsInt64Constant(const Matcher<int64_t>& value_matcher) {
+  return MakeMatcher(
+      new IsConstantMatcher<int64_t>(IrOpcode::kInt64Constant, value_matcher));
+}
+
+
 Matcher<Node*> IsFloat64Constant(const Matcher<double>& value_matcher) {
   return MakeMatcher(
       new IsConstantMatcher<double>(IrOpcode::kFloat64Constant, value_matcher));
 }
 
 
 Matcher<Node*> IsNumberConstant(const Matcher<double>& value_matcher) {
   return MakeMatcher(
       new IsConstantMatcher<double>(IrOpcode::kNumberConstant, value_matcher));
 }
@@ skipping 77 matching lines @@
 IS_UNOP_MATCHER(ChangeInt32ToInt64)
 IS_UNOP_MATCHER(ChangeUint32ToFloat64)
 IS_UNOP_MATCHER(ChangeUint32ToUint64)
 IS_UNOP_MATCHER(TruncateFloat64ToInt32)
 IS_UNOP_MATCHER(TruncateInt64ToInt32)
 #undef IS_UNOP_MATCHER
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8