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 103ecae03cd55dbda7f75be8f913491d8038dd72..ebac199c2f0a63b839a95016984011b6fe5362a1 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";