[turbofan] Add Int64(Add|Sub)WithOverflow support.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 729828e809973e66f67d656184b80d23c56dcf85..129ac16f602981313c80838617faeb4c09071740 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -2081,9 +2081,19 @@ Type* Typer::Visitor::TypeUint32MulHigh(Node* node) {
 Type* Typer::Visitor::TypeInt64Add(Node* node) { return Type::Internal(); }
 
 
+Type* Typer::Visitor::TypeInt64AddWithOverflow(Node* node) {
+  return Type::Internal();
+}
+
+
 Type* Typer::Visitor::TypeInt64Sub(Node* node) { return Type::Internal(); }
 
 
+Type* Typer::Visitor::TypeInt64SubWithOverflow(Node* node) {
+  return Type::Internal();
+}
+
+
 Type* Typer::Visitor::TypeInt64Mul(Node* node) { return Type::Internal(); }