Instrument analyzer's type analysis and run front_end inference tests.

pkg/front_end/lib/src/base/instrumentation.dart

Index: pkg/front_end/lib/src/base/instrumentation.dart
diff --git a/pkg/front_end/lib/src/base/instrumentation.dart b/pkg/front_end/lib/src/base/instrumentation.dart
index 8957d9f7e02da380d000f8153b6ff8493948e7ac..ba78dcd4b50ea499c9ace74b71d188b04e2f518a 100644
--- a/pkg/front_end/lib/src/base/instrumentation.dart
+++ b/pkg/front_end/lib/src/base/instrumentation.dart
@@ -35,7 +35,13 @@ class InstrumentationValueForType extends InstrumentationValue {
   @override
   String toString() {
     // Convert '→' to '->' because '→' doesn't show up in some terminals.
-    return type.toString().replaceAll('→', '->');
+    // Remove prefixes that are used very often in tests.
+    return type
+        .toString()
+        .replaceAll('→', '->')
+        .replaceAll('dart.core::', '')
+        .replaceAll('dart.async::', '')
+        .replaceAll('test::', '');
   }
 }