Generalize lookup-maps to support other const keys

pkg/compiler/lib/src/js_backend/backend.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 971 matching lines @@
     if (constant.isFunction) {
       FunctionConstantValue function = constant;
       registry.registerGetOfStaticFunction(function.element);
     } else if (constant.isInterceptor) {
       // An interceptor constant references the class's prototype chain.
       InterceptorConstantValue interceptor = constant;
       registerInstantiatedConstantType(interceptor.dispatchedType, registry);
     } else if (constant.isType) {
       enqueueInResolution(getCreateRuntimeType(), registry);
       registry.registerInstantiation(typeImplementation.rawType);
-      TypeConstantValue typeConstant = constant;
-      DartType representedType = typeConstant.representedType;
-      if (representedType != const DynamicType()) {
-        lookupMapAnalysis.registerTypeConstant(representedType.element);
-      }
     }
+    lookupMapAnalysis.registerConstantKey(constant);
   }
 
   void registerInstantiatedConstantType(DartType type, Registry registry) {
     DartType instantiatedType =
         type.isFunctionType ? compiler.functionClass.rawType : type;
     if (type is InterfaceType) {
       registry.registerInstantiation(instantiatedType);
       if (!type.treatAsRaw && classNeedsRti(type.element)) {
         registry.registerStaticInvocation(getSetRuntimeTypeInfo());
       }
@@ skipping 2124 matching lines @@
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 }