Add compileAll internal compiler flag.

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

Index: dart/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart b/dart/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
index fdf96ab52963ad969e39779c8df3113e6f766039..1dfe675bc360b7beb4f3fbc28a3ada3ab2cbdc34 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
@@ -758,7 +758,13 @@ class JavaScriptBackend extends Backend {
 
   void codegen(CodegenWorkItem work) {
     Element element = work.element;
-    if (element.kind.category == ElementCategory.VARIABLE) {
+    var kind = element.kind;
+    if (kind == ElementKind.TYPEDEF) return;
+    if (element.isConstructor() && element.getEnclosingClass() == jsNullClass) {
+      // Work around a problem compiling JSNull's constructor.

[ahe, 2013/06/11 15:43:00]

I had to move the work around here to make it more specific to JSNull. 
Otherwise, some dart2js_native tests broke.

+      return;
+    }
+    if (kind.category == ElementCategory.VARIABLE) {
       Constant initialValue = compiler.constantHandler.compileWorkItem(work);
       if (initialValue != null) {
         return;