[turbofan] Replace shr of masked bits with zero

src/compiler/machine-operator-reducer.h

Index: src/compiler/machine-operator-reducer.h
diff --git a/src/compiler/machine-operator-reducer.h b/src/compiler/machine-operator-reducer.h
index cddf13d9d4c859e4eb14ecf17f5eb8987daf4c76..e44521ec7870c5faf6369cf401da13b57e262893 100644
--- a/src/compiler/machine-operator-reducer.h
+++ b/src/compiler/machine-operator-reducer.h
@@ -74,6 +74,7 @@ class MachineOperatorReducer final : public Reducer {
   Reduction ReduceProjection(size_t index, Node* node);
   Reduction ReduceWord32Shifts(Node* node);
   Reduction ReduceWord32Shl(Node* node);
+  Reduction ReduceWord32Shr(Node* node);
   Reduction ReduceWord32Sar(Node* node);
   Reduction ReduceWord32And(Node* node);
   Reduction ReduceWord32Or(Node* node);