[turbofan] Implemented the ChangeFloat64ToInt64 TurboFan operator.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index c8597d97d99bac957d3183259d91c66f8b331ac7..cc96de5bf3f428ae0c3f125b98e3fc611819c8b5 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -2080,6 +2080,11 @@ Type* Typer::Visitor::TypeChangeFloat64ToUint32(Node* node) {
 }
 
 
+Type* Typer::Visitor::TypeChangeFloat64ToInt64(Node* node) {
+  return Type::Internal();
+}
+
+
 Type* Typer::Visitor::TypeChangeInt32ToFloat64(Node* node) {
   return Type::Intersect(Type::Signed32(), Type::UntaggedFloat64(), zone());
 }