Generate less code when importing dart:mirrors.

dart/sdk/lib/_internal/compiler/implementation/compile_time_constants.dart

Index: dart/sdk/lib/_internal/compiler/implementation/compile_time_constants.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/compile_time_constants.dart b/dart/sdk/lib/_internal/compiler/implementation/compile_time_constants.dart
index ecc8645823df3bf0d40b733657bf6dc2bac1a783..1861c4336cafc93c5291a74329a450b0d02f8e60 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/compile_time_constants.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/compile_time_constants.dart
@@ -56,18 +56,27 @@ class ConstantHandler extends CompilerTask {
   }
 
   void registerInstantiatedClass(ClassElement element, TreeElements elements) {
-    if (isMetadata) return;
+    if (isMetadata) {
+      compiler.backend.registerMetadataInstantiatedClass(element, elements);
+      return;
+    }
     compiler.enqueuer.codegen.registerInstantiatedClass(element, elements);
   }
 
   void registerStaticUse(Element element) {
-    if (isMetadata) return;
+    if (isMetadata) {
+      compiler.backend.registerMetadataStaticUse(element);
+      return;
+    }
     compiler.analyzeElement(element.declaration);
     compiler.enqueuer.codegen.registerStaticUse(element);
   }
 
   void registerGetOfStaticFunction(FunctionElement element) {
-    if (isMetadata) return;
+    if (isMetadata) {
+      compiler.backend.registerMetadataGetOfStaticFunction(element);
+      return;
+    }
     compiler.analyzeElement(element.declaration);
     compiler.enqueuer.codegen.registerGetOfStaticFunction(element);
   }
@@ -444,9 +453,7 @@ class CompileTimeConstantEvaluator extends Visitor {
 
   Constant makeTypeConstant(Element element) {
     DartType elementType = element.computeType(compiler).asRaw();
-    if (compiler.mirrorsEnabled) {
-      handler.registerInstantiatedClass(element, elements);
-    }
+    compiler.backend.registerTypeLiteral(element, elements);
     DartType constantType =
         compiler.backend.typeImplementation.computeType(compiler);
     Constant constant = new TypeConstant(elementType, constantType);