Split RuntimesTypes into RuntimeTypes and RuntimeTypesEncoder

pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart
index 2c2f3035430a8ca6948f90e3b48a5209daf42715..354defaeda52259dcb534b1afc63f4fd07c69369 100644
--- a/pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart
@@ -155,7 +155,7 @@ class Emitter implements emitterTask.Emitter {
         return js.js.expressionTemplateFor('#.substring($isPrefixLength)');
 
       case JsBuiltin.isFunctionType:
-        return _backend.rti.representationGenerator.templateForIsFunctionType;
+        return _backend.rtiEncoder.templateForIsFunctionType;
 
       case JsBuiltin.rawRtiToJsConstructorName:
         return js.js.expressionTemplateFor("#.$typeNameProperty");
@@ -164,8 +164,7 @@ class Emitter implements emitterTask.Emitter {
         return js.js.expressionTemplateFor("#.constructor");
 
       case JsBuiltin.createFunctionTypeRti:
-        return _backend.rti.representationGenerator
-            .templateForCreateFunctionType;
+        return _backend.rtiEncoder.templateForCreateFunctionType;
 
       case JsBuiltin.isSubtype:
         // TODO(floitsch): move this closer to where is-check properties are