Reuse RuntimeTypesNeedBuilderImpl and _RuntimeTypesNeed for kernel based elements

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

Index: pkg/compiler/lib/src/ssa/builder.dart
diff --git a/pkg/compiler/lib/src/ssa/builder.dart b/pkg/compiler/lib/src/ssa/builder.dart
index 235113269e42668b1b34b43e08acb371511d10fa..2b11417b29561e4b6dcf587e5775c26efa26b06a 100644
--- a/pkg/compiler/lib/src/ssa/builder.dart
+++ b/pkg/compiler/lib/src/ssa/builder.dart
@@ -1239,7 +1239,7 @@ class SsaBuilder extends ast.Visitor
     if (!isNativeUpgradeFactory) {
       // Create the runtime type information, if needed.
       bool hasRtiInput = false;
-      if (rtiNeed.classNeedsRtiField(classElement)) {
+      if (rtiNeed.classNeedsRtiField(classElement.declaration)) {
         // Read the values of the type arguments and create a
         // HTypeInfoExpression to set on the newly create object.
         hasRtiInput = true;
@@ -1378,7 +1378,7 @@ class SsaBuilder extends ast.Visitor
     // may contain references to type variables.
     var enclosing = element.enclosingElement;
     if ((element.isConstructor || element.isGenerativeConstructorBody) &&
-        rtiNeed.classNeedsRti(enclosing)) {
+        rtiNeed.classNeedsRti(enclosing.declaration)) {
       enclosing.typeVariables
           .forEach((ResolutionTypeVariableType typeVariable) {
         HParameterValue param =