Add top level type inference logic for integer literals.

pkg/front_end/lib/src/fasta/builder/builder.dart

Index: pkg/front_end/lib/src/fasta/builder/builder.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/builder.dart b/pkg/front_end/lib/src/fasta/builder/builder.dart
index aab930a7e3a65da8fa96c682730776f2f864a0b2..940bc78207247f717219570d50d7832138f103e2 100644
--- a/pkg/front_end/lib/src/fasta/builder/builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/builder.dart
@@ -58,6 +58,12 @@ export 'function_type_builder.dart' show FunctionTypeBuilder;
 
 import 'library_builder.dart' show LibraryBuilder;
 
+import 'package:front_end/src/fasta/builder/class_builder.dart'
+    show ClassBuilder;
+
+import 'package:front_end/src/fasta/type_inference/type_inferrer.dart'
+    show TypeInferrer;
+
 abstract class Builder {
   /// Used when multiple things with the same name are declared within the same
   /// parent. Only used for declarations, not for scopes.
@@ -132,4 +138,7 @@ abstract class Builder {
     } while (builder != null);
     return internalError("No library parent.");
   }
+
+  void prepareInitializerInference(TypeInferrer typeInferrer,
+      LibraryBuilder library, ClassBuilder currentClass) {}
 }