Make native implementation classes for classes that are used as targets in @MirrorsUsed available f…

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
index 91537ca0f93c9c6a7e6cfc60524f06e2290b9013..673e8b1b722a70743d20383d8adf64d5ac28a0dd 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
@@ -1294,6 +1294,24 @@ class JavaScriptBackend extends Backend {
     }
   }
 
+  Element getDartClass(Element element) {

[Johnni Winther, 2013/11/14 19:14:19]

We have the reverse relation encoded somewhere in the backend. Maybe we should
pull the information from a common data structure.

[karlklose, 2013/11/15 08:44:52]

It just below ;-)

Done.

+    if (element == jsIntClass) {
+      return compiler.intClass;
+    } else if (element == jsBoolClass) {
+      return compiler.boolClass;
+    } else if (element == jsNumberClass) {
+      return compiler.numClass;
+    } else if (element == jsDoubleClass) {
+      return compiler.doubleClass;
+    } else if (element == jsStringClass) {
+      return compiler.stringClass;
+    } else if (element == jsArrayClass) {
+      return compiler.listClass;
+    } else {
+      return element;
+    }
+  }
+
   Element getImplementationClass(Element element) {
     if (element == compiler.intClass) {
       return jsIntClass;
@@ -1737,6 +1755,7 @@ class JavaScriptBackend extends Backend {
    * need to access it.
    */
   bool isNeededForReflection(Element element) {
+    element = getDartClass(element);
     if (hasInsufficientMirrorsUsed) return isTreeShakingDisabled;
     /// Record the name of [element] in [symbolsUsed]. Return true for
     /// convenience.