dart2js: use ResolutionInterfaceType in SSA builders

pkg/compiler/lib/src/ssa/codegen.dart

Index: pkg/compiler/lib/src/ssa/codegen.dart
diff --git a/pkg/compiler/lib/src/ssa/codegen.dart b/pkg/compiler/lib/src/ssa/codegen.dart
index 1af507b12dca898ff8eb1562b81f9fd4fad29156..6431bbba1bd45d396e7e0084bfcf45e08950e5d9 100644
--- a/pkg/compiler/lib/src/ssa/codegen.dart
+++ b/pkg/compiler/lib/src/ssa/codegen.dart
@@ -1889,13 +1889,7 @@ class SsaCodeGenerator implements HVisitor, HBlockInformationVisitor {
 
   visitInvokeStatic(HInvokeStatic node) {
     MemberEntity element = node.element;
-    List<DartType> instantiatedTypes = node.instantiatedTypes;
-
-    if (instantiatedTypes != null && !instantiatedTypes.isEmpty) {
-      instantiatedTypes.forEach((type) {
-        _registry.registerInstantiation(type);
-      });
-    }
+    node.instantiatedTypes?.forEach(_registry.registerInstantiation);
 
     List<js.Expression> arguments = visitArguments(node.inputs, start: 0);