[turbofan] Infer proper type for calls to Date.now.

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 7219 matching lines @@
 // on the object (the one the id is set for), and a label.
 //
 // Installation of ids for the selected builtin functions is handled
 // by the bootstrapper.
 #define FUNCTIONS_WITH_ID_LIST(V)                           \
   V(Array.prototype, indexOf, ArrayIndexOf)                 \
   V(Array.prototype, lastIndexOf, ArrayLastIndexOf)         \
   V(Array.prototype, push, ArrayPush)                       \
   V(Array.prototype, pop, ArrayPop)                         \
   V(Array.prototype, shift, ArrayShift)                     \
+  V(Date, now, DateNow)                                     \
   V(Date.prototype, getDate, DateGetDate)                   \
   V(Date.prototype, getDay, DateGetDay)                     \
   V(Date.prototype, getFullYear, DateGetFullYear)           \
   V(Date.prototype, getHours, DateGetHours)                 \
   V(Date.prototype, getMilliseconds, DateGetMilliseconds)   \
   V(Date.prototype, getMinutes, DateGetMinutes)             \
   V(Date.prototype, getMonth, DateGetMonth)                 \
   V(Date.prototype, getSeconds, DateGetSeconds)             \
   V(Date.prototype, getTime, DateGetTime)                   \
   V(Function.prototype, apply, FunctionApply)               \
@@ skipping 4630 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_