cpsir: fix co19 test - use process* instead of visit* (we unadvertly removed code that recursed int…

pkg/compiler/lib/src/cps_ir/insert_refinements.dart

Index: pkg/compiler/lib/src/cps_ir/insert_refinements.dart
diff --git a/pkg/compiler/lib/src/cps_ir/insert_refinements.dart b/pkg/compiler/lib/src/cps_ir/insert_refinements.dart
index e2e6b849c70c8a271a1815f844913833b4cf97b5..207753ff2c984fc6013b082be7a5df1659152838 100644
--- a/pkg/compiler/lib/src/cps_ir/insert_refinements.dart
+++ b/pkg/compiler/lib/src/cps_ir/insert_refinements.dart
@@ -128,6 +128,7 @@ class InsertRefinements extends TrampolineRecursiveVisitor implements Pass {
   }
 
   void visitInvokeStatic(InvokeStatic node) {
+    node.arguments.forEach(processReference);
     _refineArguments(node,
         _getSuccessTypesForStaticMethod(types, node.target));
   }