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

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

Index: pkg/compiler/lib/src/ssa/ssa_tracer.dart
diff --git a/pkg/compiler/lib/src/ssa/ssa_tracer.dart b/pkg/compiler/lib/src/ssa/ssa_tracer.dart
index 09d8069766eaba9cb227e1f1ae82953d0d1c6031..14b6f95e589e005c1b10039e71b83cbc90941175 100644
--- a/pkg/compiler/lib/src/ssa/ssa_tracer.dart
+++ b/pkg/compiler/lib/src/ssa/ssa_tracer.dart
@@ -289,7 +289,8 @@ class HInstructionStringifier implements HVisitor<String> {
     String value = temporaryId(node.inputs[0]);
     if (node.interceptedClasses != null) {
       JavaScriptBackend backend = compiler.backend;
-      String cls = backend.namer.getInterceptorSuffix(node.interceptedClasses);
+      String cls =
+          backend.namer.suffixForGetInterceptor(node.interceptedClasses);
       return "Intercept ($cls): $value";
     }
     return "Intercept: $value";