[turbofan] Initial version of number type feedback.

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 e7935838820371d17bd4fe158faf0daf50e4ee7b..a370b7a02ae05969da1e5d99ad2ec885d6e417cd 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -36,6 +36,7 @@ class JSTypedLowering final : public AdvancedReducer {
     kNoFlags = 0u,
     kDeoptimizationEnabled = 1u << 0,
     kDisableBinaryOpReduction = 1u << 1,
+    kTypeFeedbackEnabled = 1u << 2,
   };
   typedef base::Flags<Flag> Flags;
 
@@ -80,7 +81,8 @@ class JSTypedLowering final : public AdvancedReducer {
   Reduction ReduceJSGeneratorRestoreContinuation(Node* node);
   Reduction ReduceJSGeneratorRestoreRegister(Node* node);
   Reduction ReduceSelect(Node* node);
-  Reduction ReduceNumberBinop(Node* node, const Operator* numberOp);
+  Reduction ReduceJSSubtract(Node* node);
+  Reduction ReduceJSDivide(Node* node);
   Reduction ReduceInt32Binop(Node* node, const Operator* intOp);
   Reduction ReduceUI32Shift(Node* node, Signedness left_signedness,
                             const Operator* shift_op);