[turbofan] Introduce dedicated NumberToBoolean operator.

src/compiler/simplified-lowering.h

Index: src/compiler/simplified-lowering.h
diff --git a/src/compiler/simplified-lowering.h b/src/compiler/simplified-lowering.h
index 0e5abeefcf2dc963069da3c586f6f7bd7736b75d..9e2a499bc6f6404ad7120e53d816529b4df2f053 100644
--- a/src/compiler/simplified-lowering.h
+++ b/src/compiler/simplified-lowering.h
@@ -41,6 +41,9 @@ class SimplifiedLowering final {
   void DoStoreBuffer(Node* node);
   void DoShift(Node* node, Operator const* op, Type* rhs_type);
   void DoStringToNumber(Node* node);
+  void DoIntegral32ToBit(Node* node);
+  void DoOrderedNumberToBit(Node* node);
+  void DoNumberToBit(Node* node);
 
  private:
   JSGraph* const jsgraph_;