Check for a passed-in type argument vector in the prolog of generic functions.

runtime/vm/runtime_entry.cc

Index: runtime/vm/runtime_entry.cc
diff --git a/runtime/vm/runtime_entry.cc b/runtime/vm/runtime_entry.cc
index eb14e4031499a76d0781ea9ef422f75f6b61f8f2..5483676159bd6f78ed36828833da47f7f73e5e8d 100644
--- a/runtime/vm/runtime_entry.cc
+++ b/runtime/vm/runtime_entry.cc
@@ -518,8 +518,7 @@ static void UpdateTypeTestCache(
         (last_instance_type_arguments.raw() == instance_type_arguments.raw()) &&
         (last_instantiator_type_arguments.raw() ==
          instantiator_type_arguments.raw()) &&
-        (last_function_type_arguments.raw() ==
-         last_function_type_arguments.raw())) {
+        (last_function_type_arguments.raw() == function_type_arguments.raw())) {
       OS::PrintErr("  Error in test cache %p ix: %" Pd ",", new_cache.raw(), i);
       PrintTypeCheck(" duplicate cache entry", instance, type,
                      instantiator_type_arguments, function_type_arguments,
@@ -549,8 +548,7 @@ static void UpdateTypeTestCache(
         "    instance  [class: (%p '%s' cid: %" Pd
         "),    type-args: %p %s]\n"
         "    test-type [class: (%p '%s' cid: %" Pd
-        "), i-type-args: %p %s, "
-        ", f-type-args: %p %s]\n",
+        "), i-type-args: %p %s, f-type-args: %p %s]\n",
         new_cache.raw(), len,
 
         instance_class_id_or_function.raw(), instance_type_arguments.raw(),
@@ -566,9 +564,8 @@ static void UpdateTypeTestCache(
             .ToCString(),
         Class::Handle(test_type.type_class()).id(),
         instantiator_type_arguments.raw(),
-        instantiator_type_arguments.ToCString(),
-        instantiator_type_arguments.raw(),
-        instantiator_type_arguments.ToCString());
+        instantiator_type_arguments.ToCString(), function_type_arguments.raw(),
+        function_type_arguments.ToCString());
   }
 }