Add Float64Round operator.

src/compiler/typer.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/bootstrapper.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/node-properties.h"
@@ skipping 1536 matching lines @@
 Bounds Typer::Visitor::TypeFloat64LessThan(Node* node) {
   return Bounds(Type::Boolean());
 }
 
 
 Bounds Typer::Visitor::TypeFloat64LessThanOrEqual(Node* node) {
   return Bounds(Type::Boolean());
 }
 
 
+Bounds Typer::Visitor::TypeFloat64Round(Node* node) {
+  // TODO(sigurds): We could have a tighter bound here.
+  return Bounds(Type::Number());
+}
+
+
 Bounds Typer::Visitor::TypeLoadStackPointer(Node* node) {
   return Bounds(Type::Internal());
 }
 
 
 // Heap constants.
 
 
 Type* Typer::Visitor::TypeConstant(Handle<Object> value) {
   if (value->IsJSFunction()) {
@@ skipping 68 matching lines @@
         return typer_->float64_array_fun_;
       }
     }
   }
   return Type::Constant(value, zone());
 }
 
 }
 }
 }  // namespace v8::internal::compiler