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

pkg/compiler/lib/src/ssa/builder.dart

Index: pkg/compiler/lib/src/ssa/builder.dart
diff --git a/pkg/compiler/lib/src/ssa/builder.dart b/pkg/compiler/lib/src/ssa/builder.dart
index c1d5d55f95748982b51a36bdcc6e7dbdfeea6726..cb5db27c481a09e1815a94e21a27cc47543d8858 100644
--- a/pkg/compiler/lib/src/ssa/builder.dart
+++ b/pkg/compiler/lib/src/ssa/builder.dart
@@ -3934,15 +3934,15 @@ class SsaBuilder extends ResolvedVisitor {
       stack.add(addConstantString(backend.namer.operatorIsPrefix));
     } else if (name == 'JS_OBJECT_CLASS_NAME') {
       // TODO(floitsch): this should be a JS_NAME.
-      String name = backend.namer.getRuntimeTypeName(compiler.objectClass);
+      String name = backend.namer.runtimeTypeName(compiler.objectClass);
       stack.add(addConstantString(name));
     } else if (name == 'JS_NULL_CLASS_NAME') {
       // TODO(floitsch): this should be a JS_NAME.
-      String name = backend.namer.getRuntimeTypeName(compiler.nullClass);
+      String name = backend.namer.runtimeTypeName(compiler.nullClass);
       stack.add(addConstantString(name));
     } else if (name == 'JS_FUNCTION_CLASS_NAME') {
       // TODO(floitsch): this should be a JS_NAME.
-      String name = backend.namer.getRuntimeTypeName(compiler.functionClass);
+      String name = backend.namer.runtimeTypeName(compiler.functionClass);
       stack.add(addConstantString(name));
     } else if (name == 'JS_OPERATOR_AS_PREFIX') {
       // TODO(floitsch): this should be a JS_NAME.
@@ -4139,7 +4139,7 @@ class SsaBuilder extends ResolvedVisitor {
       // 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.runtimeTypeName(cls);
       HInstruction substitutionName = graph.addConstantString(
           new ast.LiteralDartString(substitutionNameString), compiler);
       pushInvokeStatic(null,