Perform type inference on constructor field initializer expressions.

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/body_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
index 91569a49a6729c9703a67d87e9cda004316e88b6..3995801f29214112433ed7ae4f602ae9c55cace6 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
@@ -3181,7 +3181,7 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
                 charOffset: offset)),
             offset);
       } else {
-        return new FieldInitializer(builder.field, expression)
+        return new KernelFieldInitializer(builder.field, expression)
           ..fileOffset = offset
           ..isSynthetic = isSynthetic;
       }