Add Float64Round operator.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 70f80cbb6b81868b9dec5b90e7e2442084753e20..011848bcc02ddc07a7ae6c667854da99526ec248 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1554,6 +1554,30 @@ Bounds Typer::Visitor::TypeFloat64LessThanOrEqual(Node* node) {
 }
 
 
+Bounds Typer::Visitor::TypeFloat64Floor(Node* node) {
+  // TODO(sigurds): We could have a tighter bound here.
+  return Bounds(Type::Number());
+}
+
+
+Bounds Typer::Visitor::TypeFloat64Ceil(Node* node) {
+  // TODO(sigurds): We could have a tighter bound here.
+  return Bounds(Type::Number());
+}
+
+
+Bounds Typer::Visitor::TypeFloat64RoundAwayFromZero(Node* node) {
+  // TODO(sigurds): We could have a tighter bound here.
+  return Bounds(Type::Number());
+}
+
+
+Bounds Typer::Visitor::TypeFloat64RoundToZero(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());
 }