Use type information to eliminate unnecessary bitwise-and operations.

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index 860ef8ad3e0c466c162f3897b2ec5dc389a00654..5802ab698ff493180d922c31e3043812875880f9 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -56,6 +56,7 @@ class JSTypedLowering FINAL : public Reducer {
   Reduction ReduceJSToString(Node* node);
   Reduction ReduceNumberBinop(Node* node, const Operator* numberOp);
   Reduction ReduceInt32Binop(Node* node, const Operator* intOp);
+  Reduction ReduceBitwiseAnd(Node* node);
   Reduction ReduceUI32Shift(Node* node, Signedness left_signedness,
                             const Operator* shift_op);