Rename the global inference task and reduce it's API surface by introducing the

tests/compiler/dart2js/simple_inferrer_and_or_test.dart

Index: tests/compiler/dart2js/simple_inferrer_and_or_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_and_or_test.dart b/tests/compiler/dart2js/simple_inferrer_and_or_test.dart
index 306392c830c6909ec5010944f73ab49d65246eb3..e5a11bce438ef70af9cc3d70bb756fe65fe98526 100644
--- a/tests/compiler/dart2js/simple_inferrer_and_or_test.dart
+++ b/tests/compiler/dart2js/simple_inferrer_and_or_test.dart
@@ -97,7 +97,7 @@ void main() {
   Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(TEST, uri);
   asyncTest(() => compiler.run(uri).then((_) {
-    var typesInferrer = compiler.typesTask.typesInferrer;
+    var typesInferrer = compiler.globalInference.typesInferrer;
 
     checkReturn(String name, type) {
       var element = findElement(compiler, name);
@@ -111,13 +111,13 @@ void main() {
     checkReturn('returnDyn1', subclassOfInterceptor);
     checkReturn('returnDyn2', subclassOfInterceptor);
     checkReturn('returnDyn3', subclassOfInterceptor);
-    checkReturn('returnDyn4', compiler.typesTask.dynamicType.nonNullable());
-    checkReturn('returnDyn5', compiler.typesTask.dynamicType.nonNullable());
-    checkReturn('returnDyn6', compiler.typesTask.dynamicType.nonNullable());
+    checkReturn('returnDyn4', compiler.commonMasks.dynamicType.nonNullable());
+    checkReturn('returnDyn5', compiler.commonMasks.dynamicType.nonNullable());
+    checkReturn('returnDyn6', compiler.commonMasks.dynamicType.nonNullable());
     checkReturn('returnDyn7', subclassOfInterceptor);
     checkReturn('returnDyn7b', subclassOfInterceptor);
     checkReturn('returnDyn8', subclassOfInterceptor);
     checkReturn('returnDyn9', subclassOfInterceptor);
-    checkReturn('returnString', compiler.typesTask.stringType);
+    checkReturn('returnString', compiler.commonMasks.stringType);
   }));
 }