[turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index cc96de5bf3f428ae0c3f125b98e3fc611819c8b5..503589289c77a6c7d762f60413f5fc2cb834fe32 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -2085,6 +2085,11 @@ Type* Typer::Visitor::TypeChangeFloat64ToInt64(Node* node) {
 }
 
 
+Type* Typer::Visitor::TypeTruncateFloat64ToUint64(Node* node) {
+  return Type::Internal();
+}
+
+
 Type* Typer::Visitor::TypeChangeInt32ToFloat64(Node* node) {
   return Type::Intersect(Type::Signed32(), Type::UntaggedFloat64(), zone());
 }