[turbofan] Inline calls to Date.now builtin.

src/compiler/js-builtin-reducer.cc

 // Copyright 2014 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.
 
 #include "src/compiler/js-builtin-reducer.h"
 
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 932 matching lines @@
         }
         break;
       }
     }
     dominator = NodeProperties::GetEffectInput(dominator);
   }
 }
 
 }  // namespace
 
+// ES6 section 20.3.3.1 Date.now ( )
+Reduction JSBuiltinReducer::ReduceDateNow(Node* node) {
+  NodeProperties::RemoveValueInputs(node);
+  NodeProperties::ChangeOp(
+      node, javascript()->CallRuntime(Runtime::kDateCurrentTime));
+  return Changed(node);
+}
+
 // ES6 section 20.3.4.10 Date.prototype.getTime ( )
 Reduction JSBuiltinReducer::ReduceDateGetTime(Node* node) {
   Node* receiver = NodeProperties::GetValueInput(node, 1);
   Node* effect = NodeProperties::GetEffectInput(node);
   Node* control = NodeProperties::GetControlInput(node);
   if (HasInstanceTypeWitness(receiver, effect, JS_DATE_TYPE)) {
     Node* value = effect = graph()->NewNode(
         simplified()->LoadField(AccessBuilder::ForJSDateValue()), receiver,
         effect, control);
     ReplaceWithValue(node, value, effect, control);
@@ skipping 888 matching lines @@
     case kArrayKeys:
       return ReduceArrayIterator(node, IterationKind::kKeys);
     case kArrayValues:
       return ReduceArrayIterator(node, IterationKind::kValues);
     case kArrayIteratorNext:
       return ReduceArrayIteratorNext(node);
     case kArrayPop:
       return ReduceArrayPop(node);
     case kArrayPush:
       return ReduceArrayPush(node);
+    case kDateNow:
+      return ReduceDateNow(node);
     case kDateGetTime:
       return ReduceDateGetTime(node);
     case kGlobalIsFinite:
       reduction = ReduceGlobalIsFinite(node);
       break;
     case kGlobalIsNaN:
       reduction = ReduceGlobalIsNaN(node);
       break;
     case kMathAbs:
       reduction = ReduceMathAbs(node);
@@ skipping 185 matching lines @@
   return jsgraph()->simplified();
 }
 
 JSOperatorBuilder* JSBuiltinReducer::javascript() const {
   return jsgraph()->javascript();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8