binary-operator-reducer: reduce mul+div(shift)

src/compiler/machine-operator-reducer.cc

Index: src/compiler/machine-operator-reducer.cc
diff --git a/src/compiler/machine-operator-reducer.cc b/src/compiler/machine-operator-reducer.cc
index c174da2f7f2d6d3fcbf684749c29be71348ba338..5951fb612a9f75feb3f456f840a8c2d364cb80a2 100644
--- a/src/compiler/machine-operator-reducer.cc
+++ b/src/compiler/machine-operator-reducer.cc
@@ -648,6 +648,7 @@ Reduction MachineOperatorReducer::ReduceTruncateFloat64ToInt32(Node* node) {
   Float64Matcher m(node->InputAt(0));
   if (m.HasValue()) return ReplaceInt32(DoubleToInt32(m.Value()));
   if (m.IsChangeInt32ToFloat64()) return Replace(m.node()->InputAt(0));
+  if (m.IsRoundInt64ToFloat64()) return Replace(m.node()->InputAt(0));
   if (m.IsPhi()) {
     Node* const phi = m.node();
     DCHECK_EQ(kRepFloat64, RepresentationOf(OpParameter<MachineType>(phi)));