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 2030b7cc17b2e2111e3edf8aafacd6d150bf13f3..b4a62a1ecebf8cfc51be11481b74f7af918138c1 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1770,6 +1770,30 @@ 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::TypeFloat64RoundTruncate(Node* node) {
+  // TODO(sigurds): We could have a tighter bound here.
+  return Bounds(Type::Number());
+}
+
+
+Bounds Typer::Visitor::TypeFloat64RoundTiesAway(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());
 }