[turbofan] Avoid introducing machine operators during typed lowering.

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 69ab57abb79b77b1427fe9c64af8c1fc9d4c99bc..b1f4165c9ad2cc1a41a70e63726185219863cdb0 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -24,7 +24,6 @@ namespace compiler {
 class CommonOperatorBuilder;
 class JSGraph;
 class JSOperatorBuilder;
-class MachineOperatorBuilder;
 class SimplifiedOperatorBuilder;
 
 
@@ -88,8 +87,6 @@ class JSTypedLowering final : public AdvancedReducer {
   Reduction ReduceUI32Shift(Node* node, Signedness left_signedness,
                             const Operator* shift_op);
 
-  Node* Word32Shl(Node* const lhs, int32_t const rhs);
-
   Node* EmptyFrameState();
 
   Factory* factory() const;