dart2js: Refactoring, documentation, and a few bugfixes in Namer class.

pkg/compiler/lib/src/ssa/builder.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 ssa;
 
 class SsaFunctionCompiler implements FunctionCompiler {
   SsaCodeGeneratorTask generator;
   SsaBuilderTask builder;
   SsaOptimizerTask optimizer;
@@ skipping 4070 matching lines @@
 
     HInstruction target = localsHandler.readThis();
     HConstant index = graph.addConstantInt(
         RuntimeTypes.getTypeVariableIndex(variable),
         compiler);
 
     if (needsSubstitutionForTypeVariableAccess(cls)) {
       // TODO(ahe): Creating a string here is unfortunate. It is slow (due to
       // string concatenation in the implementation), and may prevent
       // segmentation of '$'.
-      String substitutionNameString = backend.namer.getNameForRti(cls);
+      String substitutionNameString = backend.namer.getRuntimeTypeName(cls);
       HInstruction substitutionName = graph.addConstantString(
           new ast.LiteralDartString(substitutionNameString), compiler);
       pushInvokeStatic(null,
                        backend.getGetRuntimeTypeArgument(),
                        [target, substitutionName, index],
                         backend.dynamicType);
     } else {
       pushInvokeStatic(null, backend.getGetTypeArgumentByIndex(),
           [target, index],
           backend.dynamicType);
@@ skipping 2569 matching lines @@
     if (unaliased is TypedefType) throw 'unable to unalias $type';
     unaliased.accept(this, builder);
   }
 
   void visitDynamicType(DynamicType type, SsaBuilder builder) {
     JavaScriptBackend backend = builder.compiler.backend;
     ClassElement cls = backend.findHelper('DynamicRuntimeType');
     builder.push(new HDynamicType(type, new TypeMask.exact(cls, classWorld)));
   }
 }