Preserve type arguments in generic invocation expressions.

test/splitting/type_arguments.stmt

Index: test/splitting/type_arguments.stmt
diff --git a/test/splitting/type_arguments.stmt b/test/splitting/type_arguments.stmt
index 2ba351a414c80609af4129254ffe8e96d23b0c86..96751533735e65a71ee761c0924d93bda34c0c0c 100644
--- a/test/splitting/type_arguments.stmt
+++ b/test/splitting/type_arguments.stmt
@@ -65,4 +65,33 @@ new SomeClass<
 {
   <int>[];
   <int>[];
-}
+}
+>>> type arguments on invocation expressions, all on one line
+(fn)<T, S>(1, 2);
+<<<
+(fn)<T, S>(1, 2);
+>>> type arguments on invocation, prefer to not split at type args
+(longFunction)<TypeArgument>(valueArgument);
+<<<
+(longFunction)<TypeArgument>(
+    valueArgument);
+>>> type arguments on invocation expressions split both type and value arguments
+(longFunction)<First, Second, Third, Fourth, Fifth, Sixth, Seventh, Eighth>(first, second, third, fourth, fifth, sixth, seventh, eighth);
+<<<
+(longFunction)<
+        First,
+        Second,
+        Third,
+        Fourth,
+        Fifth,
+        Sixth,
+        Seventh,
+        Eighth>(
+    first,
+    second,
+    third,
+    fourth,
+    fifth,
+    sixth,
+    seventh,
+    eighth);